I'd love to help.
Here are some youtube.com videos of the mods that were done to my tank.
In the first chamber I have my heater in chamber 2 I have the Intank basket 3 stages of filtration:
3. Fluval BIOMAX/Biological
In chamber 3, I have a sponge although I was thinking about changing it to something else.
Hope this helps, but if you need specific details search google, type: "biocube mods" and you will find a bunch of information.