Do you have sand? is it old sand or new sand?
I have used epsom salt before to try to cure a popeye on my trigger fish and I went a bit overboard and put quite a bit directly to my nano tank and it did not kill any starfish that I could see...nothing seamed to be affected from what I remember.
I would be more worried of some anaerobic area in the sand if there is sand and if the old sand was kept and moved.
Beside that, they are pretty tough little guys so this is not a good sign. I never saw one die unless it was killed by a fish or by mistake while handling frag. I even put a few in peroxyde dip without realizing it and after a few seconds in the dip they went right back into the tank and survived.
I would recommand also doing a copper test, just in case.
Do you use a well calibrated refractometer to mesure salinity or an hydrometer?
Quote:
Originally Posted by ScubaSteve
The tank was swapped 1.5 months ago to the new system. Something went weird in the transfer and it cycled. Hard. I lost all but a handful of my SPS (expensive frags went to a friend's tank). So I don't know if these weird happenings are part of the ensuing aftermath of the tank swap or if there is something seriously bad about to happen. I'm waiting for a small cycle if these brittle stars are dead.
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