HannaB Posted November 8, 2022 Share Posted November 8, 2022 (edited) I am seeking advice on how to deal with fin rot. To start, I had bought 2 juvenile angel fish back in February. They looked healthy as far as I could tell when I bought them. However, only about a week and a half later, one started to develop fin rot (fins started splaying and then disappearing). It then spread to my other angel fish. I bought Api "Melafix," and immediately started treating tank according to dosage (& took out carbon filter). It worked like a charm, and within a week, my fish had significantly improved, and fins were growing back. Another week or so later though, and they were regressing again. To make a long story short, this started a vicious cycle for the next several months where I would treat the tank with some kind of herbal medication, the fish would improve, and then the fin rot would return. I have now tried Melafix, Top Fin bacterial & fungal fix, Maracyn Oxy (by Fritz), and even aquarium salt, according to the aquarium coop instructions (I used 1 TBSP per 2 gallons water). Over the past few months, my fish have only gotten worse, they don't even respond to the herbal treatments now (bacterial resistance?), and the disease has spread to all 3 of my silver dollars. They also look like they have a bit of white around their gills (fungus?). Maracyn Oxy didn't help with that either. So I guess I now have to resort to traditional antibiotics..... however, does anyone know whether I should be worried about erythromycin (in the Mardel Maracyn medication) harming the nitrifying bacteria in the tank (I have a biowheel filter; tank has been up and running with fish for about 4-5 years). Should I closely monitor the pH & ammonia levels daily? If so, which test kit would you recommend? And do you think erythromycin alone should be sufficient, or other meds? Also, to clarify regarding the dosing of the Mardel Maracyn: my tank is 38 gallons, and the instructions say to use "one packet per 10 gallons." The video also mentions only dosing once for the entire week, but the online page doesn't give further instructions on this. So should I probably just go with dosing 4 packets at once for the whole tank, and wait a week?? Should I do another water change and dose again to be sure that the bacteria are eradicated? (I really don't want to see the same pattern again of the fish getting better after treatment then getting worse, but I also want to minimize the damage to the beneficial bacteria). Any help would be greatly appreciated!! Edited November 8, 2022 by HannaB Link to comment Share on other sites More sharing options...
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