Floating blue Parasite?

Dec 25, 2007
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Well I have a 90 Gal saltwater tank that had a crash a while back and we have not really got it back up yet. Out of a ton of fish and babis we have 5 fish left. Well today while looking in it I saw something blue floating aorund. It looks like it has legs. It looks like a small Shrimp. I mean Tiny. THen I look and there are about 3 floating around at the top. My fish seem to try and eat them but spit them out. anyone know what they are or could be? I have only had 2snails 2 sandsifting starfish, and started out with 8 mollies to season the tank. They reperduced like mad and then we had a crash. any ideas?