Yeah that's exactly how my riparium looked a while ago that bga can get out of control fast I put a large airstone and pump in mine to increase flow.axolotles can't have too much flow.
A powerhead or larger filter would be your best bet. To get rid of the algae.
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Thanks for your input.
I don't think circulation could be the #1 cause in my case. It certainly could be a factor. I asked my dad about the lights and he said that 3/4 bulbs are over a year old. Thus, the spectrum may not be what it used to and I've read that old bulbs can contribute to bga. I'll replace the lighting 1st and then see if that helps.
If not, then I'll stick a powerhead or airstone in there.