Hmmm. Tough to answer.
Technically, my first SW was a small...20g?...30g?....way back in....'75?...'76?, but I failed miserably and it was up and running for all of one or two months. Originally, it was my first FW tank and then tried SW with it when I upgraded FW to a 60g. It was so long ago I hardly remember a thing about, other than I didn't know what the heck I was doing
. I was only like 15 at the time.
Otherwise....the 135g Reef I started in Feb 2005....which is now a FOWLR and the Reef is a 180g.
Cheers
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