The best thing I would say is to get the biggest tank your budget and space allows.
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May I ask what are the dimensions on your 133 gallon tank?Sounds like your interests are similar to mine. I didn't want something as big as a 180 (or the fish that go with it), but I felt I might want more than a 120. I ended up with a 133 gallon. It's roughly five feet long.
I hate to barge into this conversation with a question. However can I ask you who or where can I find a 150 gallon tank that’s 5x2x2? That’s a dimension I have never see in my lfs. Thanks in advance for your help.good 120 is 4x2x2 and good 180 is 6x2x2...is there a reason you aren't considering a 150 ie 5x2x2 ?
But really what do you want in it?
If it's a difference between 4' and 5', I'd choose the 5'.
I'm generally interested in the smaller fish, ocellaris clownfish, banggai cardinal, blue damsel, orchid dottyback, gobies, etc., etc., etc.
The only big fish I might consider getting for a reef tank is a yellow tang, but I also like macroalgaes and I know yellow tangs eat those.