Yes, one of those. It says it's made for two-to-five-gallon tanks, the smallest I could find. I don't have it plugged in at the moment, because I was concerned about it getting too hot, since that was the issue with the water at first; it was almost at ninety (Eek!). Her quarantine tank is two gallons, but it has a little bit of small gravel in it, so it's a bit less, actually. It will be her temporary home for a while; then, I'm dividing my ten-gallon and putting her in with Turbo.