Dwarf puffers (pea puffers) would be great for that tank. Yes they do eat snails, but probably not able to take down a decent size mts nevermind something bigger. Just beware they can be nippy to long finned fish
You could also get some dwarf cichlids, like cockatoo's
Dwarf cichlids are pretty awesome I got myself a 30 gal dwarf tank highly recommend them for a small tank
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Ok the tank being so new is part of the prob its best to have the tank set up for 6-8 months and let algae grow on the back wall of the tank and if you can handle it the sides. What kind of cichlids? The neon rainbows are very pretty also galaxy rasbora those would look great together![]()