Questin ,thanks for the comment...
Agreed that they are same with yumas which love dirty water as they are found in valleys, low lying area.. However, i guess that your tank which you grow the zoas are only cater to thoes zoas and nothing else , Fish ,etc, if not, there goes your fish.Am i right to say that?
Well, im observing on my radioactive zoos and w/o strong current, i can see a most of them melting and lesses polyps are seen,
this proves the current right..