I know platies can make lots of waste, so I’m looking for a filter for at least 40 gallons. Don’t know if my tank will be a 20 or 29. I’m a huge fan of tetra internal power filters; but that takes up too much inside space. Maybe a HOB, with a sponge filter attached on the end? Preferably not a canister, but if it’s best I can try. Also would like it to be cheap. I could also run two, if it’s like a sponge filter and a hob filter.