Fish tanks help! weird?

I got my 3 gallon fish tank for my Betta fish and it was working fine within the past 1-2 weeks but today there are bubbles going up and down with the air pump filter and whenever my fish goes there he gets pulled down or left. It moves him very fast and he could get damage I don't know what to do please help me should I return the tank and get a another diff tanks?

Or I need to do a water change?
 
no the tank is okay it's the filter that is not right.if you still have the ticket of the filter and it is not too late then you should go and return it and tell them that is not working right.they can give you your money back and you can get a new one.for the while remove the filter.oh and by the way bettas don't require an air pump.you don't need to do a water change.or the problem can be that the air pump has a hole and the air is coming out of it so you think that it is the filter.but it can be the air pump.

good luck
 
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