I wouldn't use canister filters on a
SW. Too much crap build up.
Put a 29 gallon sump or something of the like on it. You'll thank me later.
Or maybe a couple big
Hob's would do the job, you're still going to want some kind of good flow on there.
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My tanks (so far

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5.5 gallon Planted Dwarf Puffer tank (2 Dwarf Puffers and a lot of RCS!)
16 Gallon Planted
(GBR pair, 3 amano shrimp and a whole bunch of snails!)