I have 2-4's on a 90 and it's a little difficult to get them from stirring sand or pelting corals! I've never had 3's but they may be a more controllable option.
I have two 1's in my 54 gallon and if I had it to do over again... I would get two 2's. I also have two MJ1200's so maybe if they will be your only pumps... 3's would be good.
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