I have a IM Lagoon 25 gal in the garage with just a heater and 4 fans no issues, and I have a clownfish breeding setup which consists of (6) 10 gallon tanks and a 50 gallon sump with a 300W heater and a 1/10 chiller no issues.
I've been to AquaSD many times over the past seven years. The store and Will are top notch. I work for a competitor and can tell you can buy with confidence from AquaSD.
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