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Battling blue-green algea can be very expensive if using pet store erythromycin. You can use erythroycin perscribed by docter or vet. If you cant get that, go to local drug store and ask for Erthrocin, very inexpensive and i dont think you need a perscription.My brother is a docter,and avid salt water geek.I have been doing alot of research with him on this. Erythromycin is one of the safest antibiotics, meaning it does not harm plants, animals, or fish. As you know blue-green algea is a bacteria. So you need to understand your tank has a bacterial infection. Bacteria is broken down into two groups, Gram-positive (G+) and Gram-negative (G-). Erythromycin is more effective on (G+) bacteria.Blue-green bacteria belongs to the (G-) group. But it is alot more sensitive to erythromycin then other (G-) bacteria. Fortunately, the bacteria important for the nitrogen cycle are in the (G-) group, and alot less sensitive to erythromycin. So your biological filter is safe. The reason some tanks experience an ammonia spike after treating with erythroycin is not because the biological filter is not functioning. It is most likely because of the high content of protein being released from the dead blue-green bacteria, which is broken down to ammonia or nitrite by the good nitrifying bacteria in your filter. Actually if you killed off all the bacteria in your filter you would never get ammonia. Thats why it is vital to remove as much of the blue-green bacteria by hand and water changes before treating. Dont turn off lights while treating tank. You will be killing off the good algea. Suggested treatment is. Day 1 - Remove as much of the blue-green bacteria as you can by hand and 50% water changed. Stop all fertilizers untill you get rid of infection. Add 2.5mg of erythromycin per gal. of water. Day 2 - Add 2.5mg erythromycin per gal. of water. Day 3 - Now you should start seeing alot of dead blue-green bacteria floating around tank. If you have a protein skimmer turn it on. Its very important to get rid of as much protein (dead bacteria) as possible. Day4 - Most blue-green bacteria should be dead by now. Make 50% water changed, picking up as much dead bacteria as poosible. Add 2.5mg erythromycin per gal. of water. Day 5-7 Keep checking Ammonia and nitrite but dont change any, unless necessary. Day8 - Make about 30% water change. Add 1mg of erythromycin per gal. of water. The big thing is, remember your tank has an infection. Hope this has been helpful...........
 
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