Unfortunately the tank was drilled with the hole in bottom for the return when we got it. Is there anything else a guy can do other than a check valve? Also a quick question about return pumps.... our quietone 6000 constantly hums pretty loudly. Its more like a resonant frequency hum but after a while it really grates on your nerves. Is this normal? Can this be avoided with say an external type pump... ie reeflo snapper gold or one similar?
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130g peninsula aquarium
45g sump
Tek light 8 bulb fixture, tunze nano wave box, vortech mp-20, rowaspas reactor, carbon, hydor preformer 600 skimmer, quiet one 6000 return
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