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one of my gupy's is behaving strangely; he kinda hovers in place, about 2-3 inches from the bottom of the tank (bowfront 36g) wiggling his tail to keep him in place.
Your guppy is shimmying. This happens when the water is not to the fish's liking, the fish is stressed or is about to come down with a disease. I would separate him and figure out what's going on.