Originally Posted by FriendsNotFood
ARCHAEA MINI AQUARIUM HEATER (25W) (28.99) from Aqua Forest Aquarium. I have two of them and they're great so far and hold the temp well. No idea how long they last but so far so good over a couple months. They're TINY and with a black background hidden behind plants you can't see them at all.
This one is nice! Only 4 1/2 inches! Slightly pricey though...