I'm changing mine shortly.
I currently have one in a 10 gallon aquarium, but I don't like it, it's not deep enough. I have a 2 gallon plastic pickle jar that I'm considering putting my small one in. I'm still trying to find the containers like Martin has for the larger one.
I'd asked about those containers on another thread. If anyone finds them, please post that info on the site. I've not been able to find anything like them yet. The closest I've found have been opaque cereal containers.