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Hi. I have 6 discus fish in my 55G tank. .. 5 of them are about 4.5" and one is 2.5". I have had them for about a month now. All arw fine but for the smaller one. I noticed that a part of the fin has started rotting. I would say about 3-4 mm is lost at max. I have maintained the tank at about 31°c . Last week I reduced itr to 29-30°c n now I see the possible fin rot in the small one. I change 50% watwr every 4-5 days. Now I have isolated the smaller discus into a smaller tank. Added few drops of methylene blue. Please suggest what do I do! ! Should I use any antibiotic or just changing watwr everyday for the small tank suffice. ? ? Thanks!

mythelene blue will not work,use rid all genera aid .use 5 ml of general aid per 5 liter of water(use a isolated tank about 25 liters)with 1 teaspoon of rock salt or sanda namak should be iodine free.maintain temperature about 28 -29 degree c.and repeat again after 2 days if required.

Thanks a lot. I have actually increased the temperature to 31°c to increase the metabolic rate of the fish. The fish is not eating tetra bits. Should I add few tetra 's so as to decrease the discus' anxiety ? And am ordering rid all general online now. Couldn't find here in bangalore. I searched in some 4 shops. Thanks again for ur time..!

If it is Columnaris then increased temp will be devastating for the fish ,,,,,, as bact propagation will b more at high temp,,,,, treat it with hostacycline ,,,,, even i feel u might have to nuke the whole tank