Great information everyone, thanks! The house was built in 1991. No 'I' beams, just 2x6s running the length of the house but no longer than 12 or 13 feet to the nearest supporting beam as far as I can see from the furnace room. Hardwood floors on the main floor.
I thought about 24" deep by 20" tall, but not sure if that's suitable as a room divider in my space. The 90 gallon that is there now works perfectly at 18" deep and 24" tall. I have a 4" sand bed which has always worked well for me so the depth of the water is actually only 18"/20". So I figured I'd keep the same height, make it 2 feet longer and give myself a couple more inches to play with.
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