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My initial guess of 300,000-500,000 households was guessing how many people have REEF tanks. The OP asked about marine tanks, which would include fish only tanks..I would have guessed closer to a 750,000+ figure for that..I should have read into the question a little more. I know a couple people who can keep fish only tanks, but struggle with any type of coral. I would also guess that nearly half of people who start reef tanks get out of the hobby within 2 years of starting because of difficulty, time, money and getting burned out. I would also guess that for every person that gets out of the hobby a new hobbyist replaces them at a pretty even rate.
I would be interested to hear what % of people who have marine tanks started out with freshwater. I cannot imagine that many people dive right into marine tanks, more probably advance in the hobby and transition to marine?
Since I was the OP... I will help answer. I think that was answered in another Poll which - @revhtree a suggestion - someone else also asked - maybe it would be nice to have the polls treated like 'articles' - ie - centralized - so that people can see all of the old results....
FWIW - I kept a freshwater tank first.
FWIW 2 - I dont know where the data comes from about how many people set up a reef tank and quit. My guess is (like @ca1ore guessed) that its not that high. But - I do agree (opinion only) - that they are replaced quickly (which may support your position rather than mine)...