i have a pair in a breeding 10 gallon tank, they have a small skimmer, an external canister filter and an airstone in that tank, its bare bottom and has a plantpot for cover, I change 40% of the water every two weeks, I feed heavily and they are healthy and have grown substantially.
I would not put any more fish or inverts in this tank,its purley a breeding/growout setup. It gets dirty quite quickly.