Tom Barr asked: >So what happens if you dose NH4 (say 0.5ppm) and do daily water changes of >50%+? >It does not cause algae. So why? You induce spores with the NH4-dose but sweeps them away with the wc? // Daniel. _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo/aquatic-plants