I use an aquaclear 70 on my 40 breeder, and I have a normal sump/fuge, I just use the HOB so there is a way for pods to get in the display without getting chopped up by a pump, I think a similar size Aquaclear with a small light would serve you about as well as a purchased HOT fuge, but it would be a lot less$$$
JMO
What do you want to keep in your fuge?