How should I treat this fish?
This is my daughter’s 20 gal glolight tetra tank. Stocked with the tetras and some Panda Cory. I change water weekly and test water regularly. Fully vac gravel etc. Water parameters are good 20-30 nitrate on water change day, no ammonia, no nitrite. Hardness is normal for my tap water. Tank has been fully set up since 2020. Tank is kept ~79 F.
Recently this fish has started floating head up, tail down when still. Swimming is fine. No other behavior changes noted. No sideways or upside down. Just floating vertical. Still active and eating with the rest of the fish. I only feed flake once a day. Once to twice a week I throw in some bloodworms.
I’m assuming this is something going on with its swim bladder? Should I withhold food for a few days and treat with something like Melafix? Then carbon treat after? No other fish in the tank are showing any symptoms either.
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