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I started my first sw tank with a 29g I currently have a 29g biocube. Size is just right if you want to get a taste for saltwater tanks, at least in my opinion. It also will allow you to get more than 1 fish, LOL, a pair of clowns would be fine in a 30g with a couple other small fish.
I used an aquaclear 50 on the 29g regualr tank and the filtration is built in with the biocube. I did add media racks for the biocube though which I really like.
I added a skimmer, a remora hang on on the 29g reg tank after a while and it worked really well with the system I had in place.