Hmm... if it were me I'd build a small shelf in the cabnet for a Walmart 1.5 gallon acrylic tank then drop a micro-powerhead in the overflow chamber to feed it and pipe the overflow from the fuge to the return chamber behind the tank. Chunk a bunch of LRR and some pods in the fuge and you should be good to go.


Kinda like this
add-on fuge.JPG