If you can add a second sponge filter with a T splitter from the air pump, that'd be good. You can then rinse them alternately every other day & keep up to more than half the auf wuchs.
I pretend water changes are upper arm work outs (& sometimes abs, knees, back, etc, too), lol. It's all good! You just have to do it! An occasional night off is ok, but not much more than that, fry lives are a stake!! OK, that was a guilt-stab, lol...but you know what I mean...