Ok, the history...
125 gallon tank gets velvet and wipes out fish.....
I let the tank go fallow for 8 weeks. Add quaranteened fish to tank (4 of them over a month period). Less than a month after the last fish was added, velvet is back and kills 3 of them....
So thats the only changes in my tank, my bio load went from no fish for 2 months to 4 where I was over feeding to get them nice and strong but it didnt matter the velvet was still there...
Now on to the issue. For the last week, since the recent die off of fish that I was able to remove before they died so there is no rot issue, my coral are acting up. At about 9 pm every night my bubble coral, my forest fire digitata, my duncan and my rbta all close right up. Its like clock work, every night at the same time they all recede right into their shell or in the anemone's case just suck all tenticles in. Now all the other coral (LPS
, Zoa's...) remain perfect, its just this select few but its the same ones every night.
Why would this be? Is the system shocked due to the lack of fish/feeding again? Is this jsut an adjsutment period or is something causing this?
Nitrate, phosphate and amonia all at 0. My filtration is strong especially for such a small bio load.