Rarely do I set up tanks with the expectation of my filtration to do all the clean up. But I do utilize my filtration to make my job of cleaning up as easy as practical. My typical approach is to set up my outputs to push waste/debris into isolated area(s). Then spot check them with a siphon to pull it out. Display tanks get that treatment more often, non-display tanks get it less often.
That said, Id first try to move the existing outputs to roll waste along the floor to one end. If that doesn't work I'd look into adding a powerhead or two to do the same.
It looks like it's been a while since you've cleaned the sponge filters. When I had a fishroom using lots of sponge filters I'd stick a 1 gal pitcher in the tank. Gently move the sponge filter into the pitcher. Lift it up, squeeze it a few times and replace it. My goal being to get the physical waste off the outside but not to dislodge too much of the good stuff in the center of the filter. Cleaning them more often also increased their flowrates making them more effective mechanical filters.