Hmmm that would be an interesting idea I just have to make sure I can get a second tank inside the stand as it is in my bedroom...You could do an overflow without drilling any holes, and a sump wouldn't add much weight. You could get away with a 75 gallon sump which only about half full will weigh about 250 lbs. I am a mason, and a carpenter by trade, and a floor can support more than you think lol.
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