thats the fixture i have and it is perfectly fine for the depth we are using. also, as i suggested, change the bulbs. first and foremost. there'll be a big difference. instead of asking around for a good skimmer look on forums for other people's reviews on skimmers. im you wont get alot of answers by just asking, you'll get alot of your questions answered by researching though. i am using a cpr bak-pak II and its served me well for YEARS, still pullin out good amounts and i still have the stock pump.
take a look at this thread about t5-ho
http://www.nano-reef.com/forums/inde...4&st=0&start=0
i read through all of it and was able to find a nice bulb choice for my tank. with no corals in the tank at the moment, you can put all the bulbs in at once. i have had to put in a new bulb every week because i dont wanna shock the corals