frozen food

[Tanman]

hi there, just wondering if anyone has tried or can tell me if i can thaw out frozen food like, brine shrimp, mysis, etc,etc. then re-freeze them after i make my concoction? is it still safe for the fish and corals? or will it do the same thing to them, (fish & corals) as refreezing uncooked meat and eating it does to us? thanks in advance.