I have 12 tanks running in my small fishroom. 3 75s each have 2 Tidal 110s and 1 sponge filter each. 2 40Bs have Tidal 110s and a sponge, 2 40Bs have Tidal 75s and 1 sponge each. 1 55 with a Tidal 110 and 75 and 1 sponge, 1 55 with Tidal 75, Penguin 400 and sponge. 2 29s both with Tidal 55 and sponge. All the tanks are fairly well stocked (I wouldnt say “overstocked”. Is my filtration way overboard?