How many Otocinclus can I add.

[Hannahg]

I have a 10 gallon tank with a male dwarf gourami, one mystery snail, and one Otocinclus. I want to add more Otos because I have read that they are happiest in groups. How many could I add without overcrowding?

 

[Barliman]

I would think two more, but remember they need enough biofilm and algae to scrape up and eat, though you can supplement with vegetables like zucchini.