Ok so I currently have a 4 inch long axolotl in a 10 gallon tank with this filter And this air pump I know this is at or above my stocking limits and I am having trouble maintaining water quality but he is just so sensitive any sort of other filter stresses him out. Because of this, I ordered a second one of the same filter and the same airpump to add to the tank too. My question is, If the flow of two sponge filters with two air pumps is too much for him, I assume it will be, would it be more efficient to have both sponge filters off of one airpump or have one sponge filter with one pump? I know that having two filters on one pump would harbor more bacteria but the flow would also be reduced by half.... So what would you advise???