Seems to me like a great idea. I say go big or go home, and since you are home, nothing left to do but go big.  A sub panel is really simple, just use a big double breaker in the main panel and run the correct sized cable to feed the new panel. Then you can wire your fish room to your hearts delight.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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