In my sorority tank, I recently bought a filter to suit 10 gallons. When they swim around it, it seems to push them around. I put some cleaned hose around the vent so they dont get any fins stuck, but I also need something to weaken the outflow so it doesnt push them around so much but also let it do its job.
On a side note: I also bought an adjustable heater for 15-40gal tank because my LFS didn't have a heater for a 10 gallon tank. If I want it to get to the 80-82 degree (F) mark, should I adjust it to, maybe, 76 or so since it is stronger than a 10gal heater?