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Good info, for if/when I add fish to my system again, but hold the phone! ;Stop.....Drain on the tank?....Brilliant!! You could even drill another at the level of the % water change you expect to do regularly and just open it up and walk away. It would only empty to the level of the drain. I have an old 29 gal on the back porch that I might have to experiment with.
Great idea. Also I forgot to share. When I perform water changes on the tank. I take a hose and hook up to the internal drain and it makes it easy to vacuum the bottom of the aquarium while you remove water. That way you get all the waste etc out with your water change and you don't have to worry about a fish swimming in front of the valve. Works great.