I have a 65 gallon tall tank with an eheim 2217 and 2211 the 2211 has the surface extractor as an inflow and have spray bars that keep the surface nicely rippled. However I have very little flow across my sand bed. Any one used a powerhead for this? I known discus like less flow and they seem happy. I would ultimately like something gentle that would push waste and food out from my planted corner and toward my filter inlet. Currently I'm using an eheim vacuum on non water change days and a python during water changes every other day. I'm having slight green algae on my sand only and I've herd flow helps with this as well. Any suggestions would be great.