Cycling rocks whitout aquarium?

[TonyHanke]

Hello everyone, in one of my threads about cycling, someone said I could cycle my rocks in a bucket before I have my tank complete, but I can't find any info on how to do it. The tank I'm planning would get started in late august/september, but I wanted to speed up the maturing process (I know that nothing good happens fast in this hobby, but technically speaking, it's not speeding things up, right?). In the actuall aquarium, I'd use some cured live rock, but I think that keeping it in a bucket for that much time wouldn't be good, correct me if I'm wrong. To seed the tank, except of live rock, I'd use Real Reef Rock, and maybe some bottled bacteria to introduce other species than just nitryficating. That's the plan. Here are the questions: Could I place the bucket in a room with some sunlight, to trigger the ugly stage on purpose to make the tank more resilient? Could there be any light near the bucket? How do I feed it, after the initial dose of ammonia? Probably I have more questions in the back of my mind, which I'll post in the comments.
Thank you in advance!

 

[tmcca]

Curing live rock in a Rubbermaid container (or similar food-safe plastic bin/trash can) involves soaking rock in saltwater with1.021–1.025 salinity, a heater, and a powerhead for flow over 1–4+ weeks. This process, usually done in darkness, allows trapped organic waste to decay while protein skimmer (if you have one) and regular water changes remove impurities.


This is done for live rock though. I would keep it dark and do regular water changes once a week. After rock is cured you can use pure Ammonia to keep it going. You don't need anything else unless it's not live rock.

 

[Terry Le]

I did the rubber trash can but with dry rocks to get it live

 

[KGscv]

I will tell you what I did and my tank is 1 yr old acro tank with no ugly stage. Hopefully it works for you too. Buy tbs premium live rock, buy some media preferrably polyb lab cause it doesnt leech aluminum, put it in a bucket with flow and heater, feed it with ammonia and let it cycle til your tank is ready. I put light on mine just so coralline doesnt die.

 

[Mr. Mojo Rising]

I've cycled rocks in buckets before, and spare tanks, and the last couple of times in a plastic tote from home depot. If you build an aquascape you need a container large enough, buckets are not big enough.

But trust me, use a fish, its much better than bottled bacteria. Cycle the rocks first of course though before you add a damsel. A powerhead and a heater are all you need, just be careful about feeding, feed only small amounts. Ambient lighting only. For my last project I cycled my rocks for 3 months with a fish, and now 5 months later not a strand of algae in my tank. 2 or 3 months of cycling and your rocks will be fully live and pest free and they will avoid algae growth. I've done this for my projects for years.

 

[Freenow54]

Curing live rock in a Rubbermaid container (or similar food-safe plastic bin/trash can) involves soaking rock in saltwater with1.021–1.025 salinity, a heater, and a powerhead for flow over 1–4+ weeks. This process, usually done in darkness, allows trapped organic waste to decay while protein skimmer (if you have one) and regular water changes remove impurities.


This is done for live rock though. I would keep it dark and do regular water changes once a week. After rock is cured you can use pure Ammonia to keep it going. You don't need anything else unless it's not live rock.

IT is better to cure the rock in the dark anyway . Be warned I would expect that when you start the tank and put in the rock you will experience " the uglies " regardless . Ask around . Just ignore it when it happens it will be normal and is caused by the addition of light and it goes away

 

[Science/G]

Yeah I agree with everybody above no natural sunlight I would keep it completely in the dark for about a month and then if you want to add some small LEDs that should be good.

 

[Freenow54]

Yeah I agree with everybody above no natural sunlight I would keep it completely in the dark for about a month and then if you want to add some small LEDs that should be good.

Also Look up how to do it . a Fishless cycle only requires pure ammonia a syringe and a good test kit ( Salifert )and 45 days minimum . More in my case . I have a strict guide to follow if you are interested. Others use dead shrimp ect . Just the same but messy to me.

 

[tmcca]

I agree with TBS rock it's so awesome.

 

[ShawnSaucier]

This is a great idea and if you have the space, definitely do it. You can help yourself and your system tremendously and possibly end up with an insta-tank when you finally build and get it wet.
I did something similar with my new system. I used recycled Haitian rock that had been dry for years. I ran this from April to September.
I placed all of the rock in a new 55g brute (gray) can and filled with salt water. I used an old return pump that was placed on the bottom of the brute can with some soft pvc tubing attached to raise the return flow higher up in the can. As the rock went in, I was mindful not to pinch the hose and at about the mid way point, layer the hose in a direction to cause the water to spin in the can. Added the rest of the rock, and filled with saltwater and a bottle of DR. Tim’s. This ran for 6 weeks, covered and in my garage. I also added a bag full of Bio ceramic balls from my LFS from their grow out system. Shout out to Top Shelf.
Water Temp kept at 80.
After that, I tested the water for NO3 and PO4. Did a 60% water change and let it go for another 2 weeks before testing again. The rocks were leeching PO4 at this point, so I added a bag of ROWA Phos and swapped it every three weeks with a 50% water change. Added note: when I did the water changes, I would remove the top layers of rock to get to the end of my soft tubing, pump off of course.. I would angle my tubing toward the bottom of the tank to stir up any mud that settled at the bottom first. Trying to remove as much as possible.
I want to say it was late June/early July, I finally received a small package from Aqua Biome of their starter media and that was added to the can. At this point I was ghost feeding the can 1/2 a cube of frozen brine every two weeks. Cycle was : Monday: Test, water change and swap ROWA
Monday add food
Monday: Test (NO3, PO4, Salinity)
Monday: water change, Swap ROWA
Late July/ early August I added a a couple of small bottles of pods and swapped foods to a combo of Beni-pets and Phyto. I also added 5lbs of real Australian Live rock rubble from Tank Stop ( in a mesh bag).
During this time, I was building out my system equipment and getting the tank ready, doing all in the garage, before moving into the house.
September 12, 2025 I moved the system inside and started filling. The Australian live rock went into a cryptic fuge in my sump with an added 7 lbs. lights turned on the 15th for a par check and went into a 30 day acclimation starting at 40% of my 100%. First fish also went in on the 15th with a couple of small frags.
I didn’t really start stocking the system until November. No real issues. Uglies were a minimum and the tank runs super clean. I feed 2 cubes a day, plus 3 feedings of dry from a Avast Marine Plank. 1/2 a sheet of nori for my two tangs every other day. Phyto is added 2-3 times a week, and coral food mixture is 2-3 times a week. NO3-PO4 are minimal. Currently have 15 finned friends in there and corals are growing nicely.

Sept. 12

November 18th

January 2026

May 11, 2026, tank just waking up.

 

[ShawnSaucier]

This is a great idea and if you have the space, definitely do it. You can help yourself and your system tremendously and possibly end up with an insta-tank when you finally build and get it wet.
I did something similar with my new system. I used recycled Haitian rock that had been dry for years. I ran this from April to September.
I placed all of the rock in a new 55g brute (gray) can and filled with salt water. I used an old return pump that was placed on the bottom of the brute can with some soft pvc tubing attached to raise the return flow higher up in the can. As the rock went in, I was mindful not to pinch the hose and at about the mid way point, layer the hose in a direction to cause the water to spin in the can. Added the rest of the rock, and filled with saltwater and a bottle of DR. Tim’s. This ran for 6 weeks, covered and in my garage. I also added a bag full of Bio ceramic balls from my LFS from their grow out system. Shout out to Top Shelf.
Water Temp kept at 80.
After that, I tested the water for NO3 and PO4. Did a 60% water change and let it go for another 2 weeks before testing again. The rocks were leeching PO4 at this point, so I added a bag of ROWA Phos and swapped it every three weeks with a 50% water change. Added note: when I did the water changes, I would remove the top layers of rock to get to the end of my soft tubing, pump off of course.. I would angle my tubing toward the bottom of the tank to stir up any mud that settled at the bottom first. Trying to remove as much as possible.
I want to say it was late June/early July, I finally received a small package from Aqua Biome of their starter media and that was added to the can. At this point I was ghost feeding the can 1/2 a cube of frozen brine every two weeks. Cycle was : Monday: Test, water change and swap ROWA
Monday add food
Monday: Test (NO3, PO4, Salinity)
Monday: water change, Swap ROWA
Late July/ early August I added a a couple of small bottles of pods and swapped foods to a combo of Beni-pets and Phyto. I also added 5lbs of real Australian Live rock rubble from Tank Stop ( in a mesh bag).
During this time, I was building out my system equipment and getting the tank ready, doing all in the garage, before moving into the house.
September 12, 2025 I moved the system inside and started filling. The Australian live rock went into a cryptic fuge in my sump with an added 7 lbs. lights turned on the 15th for a par check and went into a 30 day acclimation starting at 40% of my 100%. First fish also went in on the 15th with a couple of small frags.
I didn’t really start stocking the system until November. No real issues. Uglies were a minimum and the tank runs super clean. I feed 2 cubes a day, plus 3 feedings of dry from a Avast Marine Plank. 1/2 a sheet of nori for my two tangs every other day. Phyto is added 2-3 times a week, and coral food mixture is 2-3 times a week. NO3-PO4 are minimal. Currently have 15 finned friends in there and corals are growing nicely.

Sept. 12

November 18th

January 2026

May 11, 2026, tank just waking up.

If you can, I would try to utilize real ocean rock (fresh or dry) over manmade stuff. The porousness of the rock gives a place for pod and micro fauna refuge and pockets for anaerobic bacteria to grow. IMHO I think this is a key element in strengthening the bones of your system long term , though many might disagree.

 

[Freenow54]

I wonder about just using pure ammonia instead of food

 

[ShawnSaucier]

I wonder about just using pure ammonia instead of food

My thought behind the food was some organics for the pods, secondly as the food rots it is a form of ammonia like in a tank. Probably over thinking it.

 

[Freenow54]

My thought behind the food was some organics for the pods, secondly as the food rots it is a form of ammonia like in a tank. Probably over thinking it.

No Yours Is one proven approach. Did not know that pods were involved. Thought maybe ammonia would make no mess