For some reason, ever since I changed from 260W of 2 year old PC bulbs to 324W of HO T5's, my mushrooms have not been as full as they were. It was about the same time that I noticed my large zoo frag shriveling.
!
oh yeah... I replaced my old MH bulbs with new ones.. and it made the mushrooms lay flat and some of the large zoos (palythoas) curl up.. but in time they relaxed...