B4tn’s 2 gallon cookie jar reef build

b4tn

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I always wanted to try a pico reef but maintaining my current 75 mixed reef seems like a full time job and I just wasn’t sure I was up to maintaining 2 tanks. I ran across @brandon429 thread


Reading through that and looking at some other builds I got to thinking. I already have a salt mixing station with 30 gallons of saltwater on hand any time. if all I have to do is literally lift the rock structure out, dump the water, and refill... this might not be to hard. On top of that, on such a small scale it’s really not that expensive. So I got to planning. I picked up the following

ABI 12 watt PAR 38 lamp (Santa, AKA my son, brought this to me)

I used all my coupons and discounts at PetSmart and picked up the following for $20:
Tetra HT30 preset heater (in testing it holds the heat steady at 79.9 degrees)
Tetra whisper 40 air pump with air valve

I also picked up a 2 gallon cookie jar at target that was on sale for $17.99

And last and probably the hardest part.. I got a 100 watt mother daughter floor lamp from Home Depot for $25. I stopped at goodwill, Lowe’s, home goods, and Walmart trying to find something inexpensive that would work and settled on the one from Home Depot because it was easiest to modify.

The rest of stuff, air line, fittings, 3/8 tubing, rock, and sand I had laying around in my lab (the garage)

First I took some rocks and sand that’s been living in my sump and pieced together a structure shape I liked. I used JB water weld that I had in the garage and zip tied the rocks to hold them together till it set.

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The airline I just zip tied to the plastic parts of the heater and laid the line around the left side of the jar. I have a T fitting on the bottom to help with the angles and a check valve on the line down by the air pump to prevent back siphoning
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I used some left over 3/8 hose from another project and split it in half. I used the already curved shape of the hose to my advantage and it snapped in place like it belonged there. I left about a 1/4” gap for the heater wire and airline.
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Now the hard part. My wife is picky and since this is going in her kitchen it has to look nice. I did not want the full lamp but could not find anything under $30 that did not look like a science project. So I Broke out my multimeter, soldering iron, and reverse engineered the Home Depot light :) Basically I removed the top 3 sections of tubing and cut the wire. Since they where tied together at the upper light socket they needed spliced together.
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And the end result. It should be cycled already but I am going to go slow anyway. Right now it’s got a piece of GSP and a mushroom rock from my main tank. They are still pretty ticked off going from ultra high flow to low flow but they should come around eventually. I plan to add a war coral in the bottom, some birds nest, Montipora, and stylo in the near future. I will update the thread as i add coral and it matures.
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b4tn

b4tn

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Thanks! I just realized I forgot to get some PAR readings. This little light is potent! At the current height of 14” I was getting nearly 500 par dead center of the lid. The lid however is a PAR killer! With 500 on top I was only getting 50 through the lid. So I lowered the fixture considerably until top of the rocks read closer to 250. It’s hard in such a tight spot to get a good reading of everywhere. I may look into some better ideas for a lid. Like maybe a round clear glass panel. With the light this low I am getting some spot lighting from the cyan LED.
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Magellan

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That lid did look somewhat concerning, the way it’s shaped it seems like it would diffuse a lot of light away. But if you’re getting 250 I wouldn’t worry too much.
 
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b4tn

b4tn

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Double post: could you just turn the lid upside down?

I would think it would still be the same upside down. And it would protrude into the rock. @brandon429 was using a plastic planter tray from Home Depot. I think they where all of $2 and inverted it squeezed in tight. I may pick one up tomorrow and experiment. I kind of wanted a glass lid for both looks and also weight to help seal against evaporation though.
 

Magellan

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I would think it would still be the same upside down. And it would protrude into the rock. @brandon429 was using a plastic planter tray from Home Depot. I think they where all of $2 and inverted it squeezed in tight. I may pick one up tomorrow and experiment. I kind of wanted a glass lid for both looks and also weight to help seal against evaporation though.

I’ve thought about something like this, turned on it’s side ship in a bottle style. But I really like what you’ve got going on there, only one way to find out how well it grows the coral!
 
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b4tn

b4tn

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I looked at those. I am sure it would work but the opening was very small so I figured maintenance would be a pain. I found this one online but could not find it in the store to look.

 

brandon429

why did you put a reef in that
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Hey what a neat surprise build! You really made it fit with room decor well done

You will enjoy experimenting with that for sure, it will run well in all kinds of configurations

How well is the all blue room hue/ spill out the window blue going over with the decorator in chief
 
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b4tn

b4tn

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Hey what a neat surprise build! You really made it fit with room decor well done

You will enjoy experimenting with that for sure, it will run well in all kinds of configurations

How well is the all blue room hue/ spill out the window blue going over with the decorator in chief

@brandon429 fortunately we recently moved to a new bigger house. In the new house the basement is the man cave and has my 75 gallon reef. In the old house Our kitchen, living room, and dining room was the whole house and my reef was in the living room. she is used to having my 75 in the main room the living room so it’s not bad. It actually like you said kind of matches the beachy decor.
 
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b4tn

b4tn

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I’m not a huge fan of this kid setup but it’s going to have to do for now. With the cookie jar lid killing PAR and having to put the light so close I was getting serious spotlighting. So I went for the Home Depot plant tray lid until I can figure out something better. Light spread is considerably better. The light is 9.5” from the surface of the plastic lid. PAR is now 200-230 on high rock surfaces and the sandbed is in the low 100’s.

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brandon429

why did you put a reef in that
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what I like about these lid changeups is the ability to restrict evaporation in a way that doesn't harm vital gas exchange in the system. Im learning about the par differences between glass and plastic of you guys' measures its helpful to see.

its neat how the bubble input rate and speed of current is directly proportional to evaporation rate.

on vacations I can get out 8 days in between topoffs simply by halving my air input rate and its no harm to the system, it could go lower and run years if warranted. I like higher movement at home just to see busier polyps, but these are tunable to ultra-low freshwater loss levels and it never unbalances the co2 out/o2 in rates.

**Tyler Johnson, a great aquarist from youtube found a trick for us long ago: for the ultimate in topoff control, out to two weeks :) a blend of mini powerhead/bubbler can do it.

he turned the bubbles down to a literal trickle, enough to keep the bare minimum exchange but the powerhead does all the movement. he was able to generate multiple pico systems using this arrangement and they went out to 14 days before needing topoff, amazing stability

for me bubbling alone is enough control
 

brandon429

why did you put a reef in that
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Looking great and all those are perfect fits for the setup
 
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b4tn

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Thanks, I have a large Duncan colony and a hammer coral I can split to go in there as soon as I get a diamond blade for my dremel. I don’t have any acros ready to cut yet so I may just pick up some new frags soon
 

Michael Lane

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Very cool! Are you still using the plant tray lid?

This might look pretty cool as a pillar, with a round base and something like a stove pipe hat to house the light.
 
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b4tn

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Very cool! Are you still using the plant tray lid?

This might look pretty cool as a pillar, with a round base and something like a stove pipe hat to house the light.

@Michael Lane i am for now. I had an idea though but failed. I cut a 1 1/2” strip of the thinnest acrylic I could find. The idea was to wrap it around the inside the diameter of the jar opening then glue the short ends together with acetone Making a 7 1/2” diameter circle. Then cut a 9” diameter flat circle to glue to the top of that. All was going well till it snapped into 4 pieces when I was bending it together. I need to find something more flexible.

I saw so many tall skinny jars at hobby lobby but opted for the wide mouth jar just for ease of maintenance. But you could really use anything.
 
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b4tn

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Couple updates. I did 100% water change today. Everything seems happy but no growth that I have noticed yet. The mushrooms have started walking around a bit and the tangerine lepto is getting its orange color back. I added a purple digitata frag to the very top today.
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