I had to order heaters for 5 tanks a couple weeks ago. I bought them on Amazon and got a good deal on them, but I don't really like the size of them. They are from AquaTop and are gigantic. But they are adjustable and keep the water at 80 degrees, so it's okay :) I currently have 6 bettas and a community tank of mollies, a platy, the 2 neons that are still alive, and a whole mess of pond snail babies from my original snail, Harriet. I really want to get one of those baby bettas from Petco :( I was looking at them and they are still brown with stripes.