i have a cpr aquafuge running on a 46bowfront, its not very big, only 18x12x4 (about 2gl.), so there isn't any major stress on the tank. but for my other refugium i built a seperate stand for it behind the tank, because of its larger size, its 34x18x5.5 (about 10gl), but, i could have upgrade it to hob, but decided against it. i think hob refugiums are great, and serve a useful purpose by providing amphipods and copepods for some of the reef critters to munch on, unlike its counter-part, the sump refugium, which basicly serves as a filter.
