Help

[skb87]

I’m new to the tank world. I’m doing pretty good so far. I just got some zoas but after a day or to of ha ing then I noticed something on them. Could anyone tell me what they are and if a problem how to treat it please.

 

[C. Eymann]

Unfortunately, that appears to be a zoanthid eating nudibranch. Need to inspect for/remove egg spiral masses and dip/baste the pieces once a week for 2-3weeks.