Thanks, that was the info I was looking for. The ballast is the workhorse 3. I know there tends to be a lot of variation between tanks, but anybody have comments on running a 55 without pressurized CO2 on a 20 high. Thanks again, Dave S _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo/aquatic-plants