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I bought 5 neon tetras yesterday at my petsmart and one of them had an eaten off tail fin. My question is, will it grow back? And why do they just sit at the bottom?
I'm sure it's stress after being netted and moved, give him some time with the lights out and they'll come around. As far as the tail keep the water clean(the tank is cycled right?)and the tail will grow back, if there are no more neons in the tank I would purchase more and bring the total to 7-9 if you have more room.