I wouldn't suggest adding anything else to the 2g. What you saw at Petco was probably a species of Otocinclus catfish. They eat algae, and are small, but they need very clean water and like to be kept in groups of at least four. To clean your tank, just siphon out any detrius you see while doing water-changes, and clean off algae by hand (Mag-Float makes a tiny magnetic algae scraper for <5g tanks.).
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