Pet Smart "and I use that term with some trepedition" has a 37 gallon tank for sale with a glass cover and light for less than $100. It has the same footprint as a 29 gallon but is six inches taller. I think that wold be a very nice tank for a single pair of discus. Seems to me that two of them might just be about perfect for two pairs and a fairly reasonable price to boot.
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