Simone It has to do with the life cycle of Ich. It is a parasite that encysts on the fish after a short period of feeding it drops off, falls into the gravel, breeds, and multiplies. the youngsters then seek out a new host to encyst on. not having light disrupts their ability to find a host to attach to. Since they only have a short window of opportunity to attach, if we turn off the lights for a week and they have to attach to a host we disrupt their ability to complete their life cycle they can't become adults and breed, thusly we clear the tank of ich without meds. Gravel vacs also help by removing the critters while they are not attached to the fish. -----Original Message----- From: Simone Vicini [mailto:svicini@lcnet.it] Sent: Friday, November 19, 1999 7:36 AM To: apisto@majordomo.pobox.com Subject: thanks for rams (question for Mike) So my rams are feeling a lot better now, your advices gave me a lot of help. Mike can you please explain me how light can be a solution for ick? I've never heard about that before but since I switched off the lights my rams got well!!! Thanks a lot Bye Simone ------------------------------------------------------------------------- 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"! ------------------------------------------------------------------------- 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"!