you can also use a syringe filled with peroxide and inject it into the specific areas. antibiotics are usually helpful, but you might mess up the good bacteria in your filter. and as already mentioned, you can turn off your lights for a day or 2 with little harm to your plants. You also might want to check some of the aquatic plant forums for information on nutrient imbalances so you have a solution to your problem instead of just a quick fix. HTH Archie >>> yalleau@coas.oregonstate.edu 5/6/2004 9:58:56 PM >>> Hi All, A friend of mine was offered a 55gal tank and asked me about a good beginner's book. I've been keeping fish for the last 20 years but only 6 in the US so I do not know of a good book to advise to him. Any suggestions? My 2nd question concerns cyanobacteria. I have some growing in two 75 gal tanks. I let my tanks unattended while I was gone for 10 days and that is how they appeared. I am not for using products but despite weekly removal and bi-weekly water changes they are still in. I am careful about feeding, plant detritus monitoring... and therefore there is low OM in the tank. Erythromycin is supposed to do the job. Would someone know where I could get some (that is more than 10 tablets like what you find in stores) at a reasonable price? Also, are there other products that can be used (kanamycin, other.?). Thanks all, Have a great week Yvan Alleau Work Home Oregon State University 450 SE Atwood Avenue College of Oceanic and Atmospheric Sciences/ Corvallis, OR 97333 Hatfield Marine Science Center 541-231-9544 2030 SE Marine Science Drive http://southamericancichlids.com/ Newport, OR 97365 1-541-867-0206 ----------------------------------------------------------------------- -- 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. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader ----------------------------------------------------------------------- -- 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. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader