You can do a very nice tank without a sump up to probably 150gal. Keep in mind that your bio-load has to be low, lots of live rock, and good skimming and water movement are always a plus.
I have a 72gal sumpless that has been very successful for about a year now. I even keep SPS corals and clams!!! It just depends on what you want to do, and what you are willing to sacrifice.
I only have 2 clowns, 2 chromis and a yellow tang in there. I also have over 100lbs of liverock and a remora-pro for a skimmer.
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