Hehehehe... Harlequin's are some mean starfish hunters. They even cooperate in pairs to take down big starfish. So, umm... if you're planning on raising starfish in your fuge you'll be able to keep harlequins cuz they'll have lots to eat.
What kind of starfish where you planning to raise? Asterina?
Only some conchs get huge. Stick to the silver, orange-lipped or fighting conchs. They stay small.
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