W Wetman AC Members Mar 24, 2011 13 0 0 New York Feb 13, 2012 #11 In a 20-gallon tank, try 10cc of hydrogen peroxide (not more) in the make-up water. Boost the filter return splash by lowering the water level for a while: those shell-dwellers won't mind.
In a 20-gallon tank, try 10cc of hydrogen peroxide (not more) in the make-up water. Boost the filter return splash by lowering the water level for a while: those shell-dwellers won't mind.
