It's a scud aka gammarus shrimp. There's both freshwater & saltwater scuds. Great live food for shrimp. I have tons of those in my freshwater shrimp tanks. They feed on detritus and dead vegetation. I made the huge mistake recently of using a turkey baster for both brackish and freshwater shrimp tanks. Some of the scuds transfered to one of my brackish opae tanks. I've probably removed at least 70+ from the tank. I think I got most out. I remove a few everyday. These got out of control in my FW tanks. At one time I probably had easily over 2000+ in my 10 gallon tank. I was feeding them to some fish but no longer have the fish. Population got out of control. Now I'm trying to get them all out but I doubt I can.
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