Hi Dale,
Thanks again for your input. A larger in line return pump with multiple returns makes sense. As for passive cooling, it's not going to work for me. This tank is going in my living room and I have radiant heating in the floor.
BTW I'd be careful with your sump on cement. I have worked a little with glass and I've been told that you should never have glass and cement in contact. Something about a chemical reaction between glass and cement that causes the glass to break. I think that any layer between them (maybe even paint) would eliminate this problem.
As for filtration, it seems that there are many schools of thought out there. Ive seen everything from aggresive skimming, treat it like fresh water and even "I've had mine running for years with an under gravel filter only". I geuss I'll just take it slow and keep an eye on things. I only live a few blocks from the water, so if I have to send anybody back home, it's not a big deal.
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