<a href=showthread.php?s=&postid=12435618#post12435618 target=_blank>Originally posted</a> by Canarygirl
Ditto on no luck with emeralds, but here's what a guy told me who owns a tank design/build/maintenance business. He said that when his clients get valonia, he shuts off their florescent bulbs for a couple of weeks and runs halides only. He says that this will kill off the valonia in every case. I haven't tried it myself but I really need to do something....