yeah, there's a check valve, and I have the backup that the output is only 3/4 of the way up. I tested it, before installing the valve, and I have room in my sump for the backflow from the display tank in case the check valve fails.
the check valve's spring is stainless steel, but I'm a little nervous still having the metal in the tank... I was thinking of removing the valve at some point, and only having the empty space in the sump as backup.
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Everything I put in my tank is fully dependant on me.
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