The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Thanks for the advice.
I try to feed them with clams, hake and squid, besides the detritus of the tank.
Maybe it is a lost case, we'll see.
It is, for sure, a sand sifter and a Astropecten, but not a polycanthus !
The search goes on but, almost there.