Hi Carol, I have both Val and Crypt in my tank, and dosed substantially more (about twice as much) than Erik Olson indicated in his April 19th post about Luis Navarro's Excel treatment for algae. I posted my results April 28th, including the effect on the various plants in my tank. The Val and Crypt were affected at my higher dosage, but it was minimal and all have recovered. I do not recall Erik mentioning any problems at the dosage levels he used, in fact he sold several large bunches of Val at mini-auction at the end of the last meeting. Hope my input helps. Roy _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member