Problem in reef tank

[Reef2011]

Ive got a crimson star fish had it for 2 yrs and it has just started to eat corals I'm after like a breeding tank but bigger most breeding tanks are about 8 inches I'm after something about 12 x 8 x 6 any ideas on what I can use it would be fixed in tank so needs to be see through

 

[mr_X]

why not get rid of the starfish? you would rather have a plastic container hanging in your tank than get rid of the coral eater? sounds like an easy problem to fix!
i would take that thing to the LFS lickity split!
that said, you could get a HOb refugium and keep it in there. they also have in-tank refugiums. look at this link about half way down-
hob refugium | Marine Depot