Mine is a new setup, but it is a 14g Biocube. I have done all the little mods that everyone else is doing (removed bioballs for rubble, widdened the overflow, replaced stock pump, took out all the sponges and media, etc.). I also added a third 24w pc bulb bringing it up to 72watts. The only Issues that I have come up with is first I had a heating problem over night, but that was because I didn't have my fans on a timmer to run w/the lights and leaving it on over night cooled the tank off too much. My second problem is that I was using 100micron size filter floss over the drip tray and it was decreasing the water flow into the third chamber so much that the pump would run dry. Other than this I love my little setup in my home office and I am looking forward to watching it grow.
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