Yes-I'm happy to use a less-invasive method than chemical dosing, and was encouraged to hear that others had success by limiting the light and manual removal. I'm going to do that. I think it all started because I got lax with waterchanges in the spring. Thanks for your help. I guess I have 3 fish named Mike, Brett and Gary. -sj You wrote: Try some of the other suggestions already given. EM will only temporarily treat the symptom. If you don't change the conditions that encourage the algae to grow it will return again and again. Antibiotics are used too casually in this hobby already. Mike Wise --- end of quote --- ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!