I am wondering if I need to have an air pump in my betta tank? I was told that I didn't need it but all the information I'm finding is mixed. I'll be separating my betta's into different tanks here in the next couple of days. My dividers have been holding back the water current so neither of them will have this anymore. I was thinking about taking the air pumps out and just leaving the filter going. I'm going to get sponge filters for all my tanks but it's not going to be any time soon sadly

. I just need some advice on this. Both of them I have it set up where I can adjust the bubbles but one even on the lowest setting still seems to be a bit much.
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10 gallon: Red male betta & mystery snail
15 gallon: Blue male betta & two mystery snails
29 gallon: Ten swordtails