My tank includes: percula clown, maroon clown , flame angel, coral beauty angel, pixie hawkfish, dragon goby, moorish idol, hippo and yellow tang and soon a dwarf zebra lion. I hear my crabs dont have much of a chance with either eel or the lion and my coral banded shrimp may not last either. It seems that the zebra has little chance of hurting the fish but will get to 5 ft and is 150 bucks and the chain link has a bit larger chance of hurting fish only gets about 2 ft and is only 50 bucks. does this sound like an appropriate appraisal?