Please be kind, New to keeping fish.. I have a 54litre tank with two goldfish they both had white spot and one had fin rot, I treated the white spot first with medication as both fish had this and the spots have fallen off them both (during this treatment the fin rot got worse on the second fish) after 4 days did a 75% water change, cleaned gravel and removed carbon from filter then dosed with fin rot meds which I think has improved the second fish but his tail fin has completely gone now and he just has a stump.. He still swims around normally though and hes in a floating isolation tank as I noticed the first fish is nipping his tail when he's in the big tank. It has been 2 days since i medicated for fin rot, not sure whether to leave the tank as it is and do the water change etc in 5 days time then re-medicate for fin rot or to change the water between this? Do I put the carbon in the filter if so and re-medicate?
Any help appreciated
Any help appreciated