So i have small dwarf golden barbs. They are found in lakes with a slow current. So... how do I determine best filter flow rate for them without sacrificing water filtration? are there signs to look for in the fish to know how they're coping? I'm running an aquaclear 20 in a 10 gallon planted tank. I have some floating plants and a sponge on the intake tube. I also have a an airstone working on a slow bubble rate in one corner of the tank and plan to add a spoonge filter in the other corner to hoipefully improve water flow rate and filtration as well as have a backup in case I need a quarantine tank set up