What Heater for a 2.5 mini bow?

[moespeaking]

The fluctuation between light on and off is about 4-5 degrees so I wanted to get a heater. I hear about people putting heaters in their aqua clear 20 filters. The only one small enough for that I can find is the mini heater which doesnt have a thermostat. What heaters are you guys using on your pico reefs?

 

[murfman]

I use the mini heater. I will unplug it or put it on a timer during the day, once the weather warms up, and only run it at night, when the lights are off.

 

[EmergencyRn]

I just did the mod to the aqua clear 70 for space for the heater. Can't do on the aqua clear 20 or 30, too small.

http://www.reefcentral.com/forums/showthread.php?s=&threadid=601201

The small heater that i found was 6" 25 watt. Even 8" will fit in Aqua clear 70, with control dial sticking out of top.