Glass Bowl Fish Tank Heater Options

[Gilo]

Hello,
I have just been given a glass bowl fish tank and a couple of tropical fish. What i need now is a heater for the tank to keep it at a constant temperature. I have found many cyclinder shaped heaters but was wondering if anyone new of a circular shaped one that could be used with a bowl fish tank? Advice would be appreciated.
Thanks
Giles

 

[minxfishy]

You can get some smaller size heaters that might fit. You dont say if you have a filter for the tank, if you dont, you will need one

 

[waterdrop]

Agreed, they'll die just as quickly from the ammonia and nitrite as from the cold.