Be careful with the plecos if you are growing live plants. They'll eat the plants when they get bigger. Also, if you are like me and plecos skeeve you out, otocinclus cats are nice algae cleaners and not nearly as ucky looking.
Barbs do pretty well in smaller tanks, but they can be semi-aggressive, so you can't mix them with the other fish you are talking about. They are fun to watch, though. You can definitely tell they are schooling fish.
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