I'm thinking about getting a Coralife Biocube 29 and using it for freshwater. Freshwater because I've never done saltwater, and have no desire to. I love the size and design of the Biocube. But I have some questions. 1. What are the fans in the lid for? To cool the lights or the water? 2. I'd like to use my Fluval 206 canister filter with it, but with the design of the wet/dry compartment in the Biocube, I don't see how it can be done. Any insights? 3. Where would I put the heater? I didn't see any cutouts or notches for the power cord.