Yes I can confirm this. I started my colony 3 years ago, always with fish (30 gallon Heavily planted tank). I started with small fish (chinese danio gold) and mooved up to bigger fish. Now they in there with an African dwarf frog, 2 chocolate gouramis (used to be 6), 3 blue dwarf gouramis, 2 peacock gudgeons and a bunch of endlers. Offcourse a lot of the baby’s get eaten by the gourami (You can see them hunting in the plants), but still enough make it to keep the colony going. Before the dwarf gourami’s, I could even sell 50 or so every 2 months. A year ago I even stopped target feeding my dwarf frog, so my best guess is he is surviving on baby shrimps he accidentally puts in his mouth 😅
My tank: