help zoa's
 

got a zoa's colony rock, don't know what stings it? any idea? they are all closed up... even tried on a low flow are, still not opening, water perimeter are all good.. :question:

have you checked for pests like nudibranchs?

How long has it been in your tank? Give the little guys a bit of time to acclimatize imo.

zoa's help
 

well had it for six months, no nudi, i do have a file fish , but he dosen't nip on it.
phosphate are now, nitrate,low, but i don't know how i am getting diatom blooms?

Can you post a pic and type of zoas?