not the type that stay small. these are brown bullheads & i've had them a few years. i also have a small yellow bullhead that has been slowly growing in a 20 gallon tank with some of the moss. they rather hid than be seen in the tank so i have things for them to hide in besides the moss. i was planning to put them in a dedicated pond this summer but i've been working so many hours i've been too exhausted to do much of my planned projects this past year.
i have in my planted 20g Nana anubias, Wendtii crypto, Windelov Java fern, and i think i got an El Nino fern a few weeks ago. also, plenty of java moss that i have to keep cleaning that out. also duckweed that i would toss in my pond when it gets to be too much. this time of year i don't have a lot of duckweed in the tank but by the time spring comes i'm cleaning the tank out again.