Could be that he is loosing his teeth and new ones are growing in. Payara do that too. They might purposely knock them out to get the news ones to come in. My friends payara has a retarded tooth that always grows in crooked and it will ouposely bang it on the glass or furniture to get it out. Be patient they all need to loose baby teeth
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happends alot whan there smaller. they will rub them out and new ones grow in. Hill be fine and its never stoped mine from eating. Theres nothing you can do and I think trying to do anything with messing around with the tank will just freak him out and he can bang himself up even more. so just let him be and do his thing. once he reconizes the tank and he grows bigger he wont bang on the sides as much.
My boy loses his teeth every now and then. I always know when it's about to happen cause hell not eat for a day or two then his teeth will get all gnarly and fall out. By the next day he's always cutting new teeth.
