Unless you have a euro-braced tank, you need to watch out for the location of the two center braces if you are using only two bulbs. The center braces are weakened under hot MH bulbs if placed near the MH bulbs. Tomoko _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo/aquatic-plants