Best sized 3-4ft tank for a Fowlr setup??

My fowlr is a 4ft 120. Its only been running for about a month but i love it so far
 

Ill get some new pics this afternoon
 
Usually for these type of questions, it depends on what fish you’re interested in. Some fish will prefer the length of a tank, while others prefer the surface/bottom area, and very few will even prefer height.

Given that your constraint is length, go as big as you’re able... so definitely 4ft length. I agree with @york1, a 4ft 120g is a great all-around tank. You still have to avoid some of the tangs that prefer 6-8ft long tanks. But otherwise it’s a very good and flexible option.
 
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