ive seen a couple biocube hqi up and running and no heat probs, another good one is the jbj also has a nice hqi and it comes with a wave maker http://www.nanotuners.com/product_in...roducts_id=435. you can always buy one of the cubes and get a led retro fit and have less of a heat issue and good lighting http://www.nanotuners.com/index.php?cPath=73