Croberts1981
New member
Hi there, I'm getting my 20 gallon tank set up prior to bringing home an axolotl. I purchased a tank that came with a bubble wall and I was told that the filter that came with the tank is not strong enough and that I should invest in a sponge filter (40 gallon) as well. My question is, would having a sponge filter and bubble wall add too much oxygen to the water? Is that even a concern? I'm in the processes of cycling the tank now. Thank you