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In a flood drain system where using a timer for your pump, do you need to aerate separately from the pump so you have oxygen in the fish tank during the "drain" period of your cycle?

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My six media beds drain into standpipes, pencil thin streams of water, so the water is well aerated while draining.  Still, I use a separate pump for aeration in the tank, to supplement during hot weather and as a redundant source of aeration, should the other pump fail.  I wouldn't want to lose fish that I've fed for several months.  It is generally held that you can't have too much aeration.

Thanks for the help! I went ahead and got an air pump but I like the standpipe idea too!

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