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I currently have a 10 gallon with 3 albino corydoras, 2 otocinclus (for eating brown algae) and 4 nerite snails (also for eating brown algae) Water tests fine but I wanted to know if I could add a 1-3 more albino or panda corydoras?

You can providing that you have a decent filter. But don't get to compulsive because it is only 10 gallons. Definitely do not add anything else after you add them.