I thought the same but my two cleaner shrimp are doing fine. They released lots of what I think are baby shrimp into the water column last night or I had an explosion of amphipods and copepods all of a sudden. I saw a few serpent stars out eating the dead trochus snail last night that I never saw before and I also saw a few of what looked like cucumbers coming out of the sand bed and eating sand. I made a thread with a picture to find out what they were. Also my nassarious snails were out in full force non have died from what I can see. But my tube worms still haven't come out and I don't see any asternia stars anymoreSounds like one of those two tanks probably had copper used in it.
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Filter floss? Do you mean poly filter?