Originally Posted by Aus
I don't bother to heat the microtank I currently have - but I do have a small circular undergravel heater that would take the chill off in winter. It was sold as a betta heater, lol- be lucky to stop a shrimp shivering in this weather, I think I'll never use it for bettas. But for a nice bowl of shrimp..
I think I have the very same one for my 3 gallon Kritter Keeper. I bought it for $12 I think......says it heats 2-5 gallons, so my 3 gallon was perfect.
It does a really nice job heating in the winter, though. And if my fish and shrimp get chilly, they just move closer to the heater.
It's a circular rubber mat with the cord sticking out of the top/side and it came with a suction cup so you could stick it to something (i.e. the tank wall in case your gravel isn't heavy enough as in my case).
I love it though!