what is flow and lighting like?
Flow is pretty decent, I had 4x RW8 pumps (one each side + 2 on the back wall) running at 100%. I have no way to know for sure but it appears that jebao pumps run a bit slower than advertised but I assume I still had at least 35-40x times DT turnover/hour depending on how clean the pumps were.
Around 2 months ago 1 RW8 recently broke. While on paper I have enough flow I also thought that I could step it up and see if that helps so I replaced it with a QP-16 and I have another QP-16 coming for Christmas. If I ran those at max with 2 RW8s I would have ~65x DT turnover, I will be able to lower it a bit and play around to see if I can find a sweet spot.
As for lighting I have 3x Mars Aqua lights. I know they are cheap and at the bottom of the pile when it comes to lights but I know for a fact heaps of people have no issue growing coral with them. I have tried having them on low light to not blast coral but that didn't stop anything so I ramped them up over a few weeks and still didn't get any improvement.
I have a very heavy bio load and frequently feed my fishes. I measure my tank parameters weekly. For the last six month my NO3 had measure 16-20 ppm and PO4 0.3 to 0.4. SPS did not grow much, Euphyllias were polyped out and happy. Acans grew and were happy as well.
Being unhappy with my growth of SPS, I decided to put a refugium to grow chaetomorpha. Over the last month, my NO3 dropped down to about 4-6ppm. PO4 interestingly did not drop much until just this week. It stayed relatively high until this week. Then I started to see it go to about 0.18-0.12.
During the past month, my Alk has been hovering between 7.75 to 8.5 and Calcium at about 380-400.
What I did notice during this past month as my NO3 was going down 1st was:
1. I lost 2 wall's frogspawn, 2 hammer corals, 1 bubble coral. They slowly receded and died.
2. My Acans are doing fine
3. I have lost 4 SPS colonies from STN from the base up.
I wonder if our corals have a difficult time adapting from high levels of NO3 or PO4 to lower levels in a relative short amount of time? (short amount of time being if my corals were used to high levels of NO3/ PO4 over the last six month to a sudden drop over a one month period)
Just sharing my observation, since I too am struggling with this issue right now.
What do fellow reefers think about the idea how quickly NO3 or PO4 drop may affect our LPS from a stable but higher NO3/PO4 levels?
Thanks for the input, it's quite hard as there are so many possible reasons and everyone could have the same issue or completely different ones :/
I've tried SPS a couple of times and even got one to live for a couple of months in my old tank (heavy feeding and 0 NO3 & 0 PO4 but full of derbesia). But I couldn't get any to live for long in the new tank, I tried one frag back when I had low nutrients and tried another one after I raised the nutrients up a bit, no luck for either.
I do think massive drops might cause a temporary impact on sensitive coral, but I would have thought it would only happen with larger drops than what you experienced.
Man what a mystery.. It seems you've gone thru everything. What brand salt do you use? Any settling occur in the bag/bucket? What brand of alk/calk/mag do you use? Heavy metals not being in the Triton test was suprising. So is the apparant 1mo. life span of certain corals in your tank. What fish are in the tank again? Anything that likes to peck? Ive had a few hammer branches just die for no reason, but usually one of 20 and very randomly, not a whole colony. Have you double checked your tests against other tests? Do you run carbon? Could it be Alleopathy?
In the old tank I used NSW but since starting the new tank I have used exclusively Red Sea blue bucket (closer to the levels I want to keep than the coral pro salt is). I was doing regular WC at the start but a few people thought I might have too low nutrients so I stopped to slowly raise NO3 to 25ppm and then started one WC every month or two to keep it there, unfortunately higher nutrients didn't seem to help either. Also no settling in the bucket, I give it a good mix before I use it.
I use Randy's for the big 3 and I mix it with 0TDS RODI and 100% pure ingredients, I mix 9L at a time and store it in safe drinking water containers.
The Triton test surprised me too, I'm doing a bit of a tank reboot atm and I'm going to try and get around to doing another one in a couple of months and see if there is any differences. The fairly consistent lifespan of stony coral is interesting, the last stony corals I added were mid May and they all kept to the 1 month +/- a week or two. The only coral I have added since then was a tiny scolly I collected early July and it actually lasted just over 2 months although it didn't look good for most of it.
The fish I had were:
1x Blue tang
1x Yellow tang
1x Bristletooth tang
1x Black Cardinal
1x Darwin glow fairy wrasse
1x Yellow tailed damsel
2x Clowns
1x Bicolour dottyback
None ever picked at coral from what I saw. And I around the time this all started I switched from Red Sea tests to Salifert tests. The Salifert were different by a little bit here and there but overall very close.
And do you mean Alleopathy from the algae issues I was having or from other coral? I did consider that the Derbesia algae may be releasing something into the water but again I had a tank full in the old tank and it never caused any issues. I also run Seachem matrix carbon, usually changed at least every 1-2 months even though they claim it lasts at least 3.