I am intrigued by this concept so I decided to try a simple small scale DIY so run on my 20L. Marina HOT breeder box $12 and the plastic screen $.69. Its powered with air and is really well lit by the lights already on the tank so it costs me nothing extra to run. The top layer it 18 sq inches which is small for that size tank. I was picturing the larger version of the box which would have been the perfect size. Im not sure if it will provide sufficient flow for it to function as intended but we shall see.