I got a big hydro sponge filter in my 125 tank.I got it mainly
as a add on to my two Rena canisters.I also got the sponge on
the return inlets of the two canister. the cleaning instructions
say to clean in faucet with cold tap water.,but wouldn't the
chlorine be bad for the sponge and my tank?
should I just clean it like I clean the filter media with aquarium