Thanks, WinterWind. The tank is 3 gallons. I have a 1 gallon as well, but at the moment, it houses snails only. I hope you get your frog. I'm just thinking that maintenance would be frequent with a one gallon is all. If your house is fairly warm, you may not require a heater, though they do prefer mid/upper 70's to mid 80's from what I have read. Quite different than fish in that she is either quiet or fairly active. I haven't observed once the lights are out, but I understand they are much more active at night.