I have a 75g tank with two 250w 20k pulsrite mogul bulbs as well as 2 URI Aqua D-light vho actinic. The halides are about 2 months old, and the vho bulbs are about a month old. Since adding the new bulbs, I have notices that my anchor coral and bubble tip are not as big or as open as they use to be. Also, only a few of my zoas have been opening. However, my dersa clam seems to be doing well. The zoas are mid to high in my tank. The clam, bubble and anchor are all low. Before replacing my bulbs, I was starting to get a carpet of cynobacteria. I changed the bulbs hoping it would help that issue. Since changing bulbs, it has gone from velvet carpet to a stringy mess on my rocks. I have the dip test strips and my nitrate and nitrite are both at 0. Alk looks to be 180ppm and ph between 8.2-8.4. I use ro/di water, my filters are about 7 months old. I do 20gal changes once a month and go through about 7 gal a week in top off. Are there other tests I should be doing, or something I might be missing? I'd hate to lose my bubble tip or anchor.