I'm curious...I'm running three tanks right now. On my 90 gallon and 60 gallon tank, I have a AC110 and a Tetra filter on each of them. On my 180, I have an FX5. I could easily do this on my two smaller tanks, but what would be the best way to do this on my 180? I have a couple small HOB filters, would one of those work? I'm thinking it should, since I'm not using it for actual filtration...