I have had three deaths in the last 48 hours and we have no clue what is happening.
We have a 33g long with about 12 small to large live rocks we obtained from a healthy tank, as with the live sand. We have a refuguim made from an aquaclear 75. Our heater, which is brand new, holds steady at 75 at the time, and the tank does get some sunlight, for the live rock. We have a very small colony of blue star polyps. Our Parameters are Nitrate/Phosphorus at 0ppm, the KH was between 8 and 9, salinity holds steady at 1.025. Fresh water is added twice a week, water changes 1g once a week as well. The water was cycled from another tank when we got it, and the tank had never had any disease whatsoever. Inhabitants are as follows: 2 cleaner shrimp, 2 peppermint shrimp, 7 hermit crabs, 1 bengaii cardinal. The fish that have died are a Leatherjacket Filefish, and 2 yellowfin saddleback clownfish, a mated pair of juveniles just preparing for a first round of babies. Other contents of the tank are a piece of mopani, and a plastic plant to provide some "green" in there. There is a couple empty shells and a clean, dead barnacle piece. We have one powerhead at the top of the tank. It's a smaller one.
The fish had NO symptoms before death. The Banggai is a little territorial, but nowhere near aggressive. The filefish died first, rather suddenly, presenting no symptoms whatsoever, found on his stomach at the BOTTOM of the tank, where he loved to hide and play with the shrimp. He had typical filefish behavior and was his usual slow, curious, lethargic self, acting like a leaf, and then, dead. Within hours of him, the female clownfish was spotted stuck to the aquaclear intake, and I freed her from that, only to notice a thick white slime on the right half of her body and an inflamed gill plate. Not even an HOUR before that, she was fine, playing with her mate like she always had. Not even an hour before posting this, the second clown has completely vanished from the tank and I suspect the clean up crew got to him before I noticed him dead. Of course, the Banggai and the clean up crew are perfectly fine, as are our small, sensitive colony of star polyps. I am so confused; what on earth is killing off my fish?
As a preventative measure, I've fed them some garlic-laden foods, and have turned up the temperature to 84 degrees Fahrenheit, hoping to kill off whatever is killing off my tank...The shrimp cleaning antennae are shorter than they were this morning, and the Banggai is hovering by the heater as he has the whole time we've had him (couple months now). Does anyone have any idea as to what on earth is happening here?...