I have larger size rock gravel.

I have a hang on back Aquaclear filter with an adjustable flow.

I keep three adf's in a 29 gallon tank with a number of fish. My tank is heavily planted. In a ten with only frogs I would probably do 6-8.

They like hiding spots. Little caves and plants are good.

I feed mine zoomed pellets in an oyster shell.

I have a journal on bettafish.com called betta testing, where I talk a lot about my adf's and have a lot of pictures.