I actually just sold the AC300 fuge I modded. I did things differently though..
I used one end of the media basket as my barrier..I made a little extra room for a heater. I did the exact same thing with the grill in the front and the mini impeller.
all you have to do is buy the coralife mini aqualight. It fits perfectly over the Ac300. I kept the top on mine and cut a square out of the top..i then siliconed clear plexi for the light to shine through. the pics I have rean't that great, but they show my mod..it is a bit diferent then magnolias...doesn't require quite as much work..and you will have the top intact also..so no openings.
fuge:
Top:
Just buy a 6700k bulb and you are done..a similar alternative to