i got a nice heater today... (cant remember the full name but it has the word stealth in it...) it doesnt have an indicator light but i felt it with my hand and it seems to be working... it also has a dial that i can put on the exact degree temp i want, its shatterproof, completely submersible, and has an auto shut off so when it leaves the water it shuts off til the water touches it again... so i have it pretty low in the tank since its completely subemersible and i think it should work nicely... its alread raising the temp after 20 mins... im just glad i didnt lose anybody due to the temp variances... lesson learned i guess...