Don't run a powerhead on sponge filter. It will get clogged up and compacted at no time. Sponge filter is best operated with low flow air pump as it is intent for biological filtration only. If you want mechanical filtration, you need to get an internal filter. There are many internal filter in the market that is quiet, compact and not eye souring as DIY soda bottle filter. You should look for one with secured attachment to the rim with hang on or magnetic device. The suction cup type is an annoyance as it comes off easily with age.