How to Find and Kill Evil Hitchhikers

[Murminator]

Originally Posted by Dragonsteeth

What could this creature be that seeks and destroys several fish overnight?

This was my question also I been trying to help her on AA also. I cannot see a crab killing a blue sided wrasse, royal gramma, clown, damsel, midas blenny, and 3 shrimp in one night with no visible scars.
I think it is biological the tank does contain 2 sea apples and 2 anemones I think the apples got stressed released something(poison) into the water killed everything and since it was such a small space it was quickly skimmed out by morning
......but I have recently fallin off a turnip truck ....so I been told