It would be great if we could know the ages of the posters along with their dream tank. I've always been amazed how our dreams change with age.
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I don't know how big of a tank I want. I know it would be an entire wall; probably 25' or so. Half wall height sitting on a stand and probably 2' from the ceiling. Black background, beige colored sand. Probably some fair sized white tip reef sharks for the lower area and bright colored tangs, clowns, triggers, etc. for the uppers.........
I'm 32 btw. Maybe 15 years ago, I'd have said 150,000g with a great white; just for comparisons.