I got tired of the lack of 24" T5HO fixtures out their. thier is only 4 bulbs, I did find 1 6 bulb but they wanted $650! so i built my own 24" 6bulb T5HO fixture for $300 including bulbs. thought i'd maybe give you so more ideas.here's the link to what i made. gotta add the final pics as it is all installed on the tank now.
http://canreef.com/vbulletin/showthread.php?t=61188