You should pnly keep one trigger in a tank with the exseption of the Nigers they can be introduced at the same time and may even mate the get between 6and 8 inches in a tank I have seen them 10 inches. The pick was a nice close up, any triger is hit or miss as they have these big teeth that are made for grinding hard corals down. THey make thier own sand, softies are generaly ok with them onlike angles they seem to nibble on softies more than sps.

Bill