I'd honestly skip the melafix for the time being. It's not that it doesn't work, for I think it can, but it more of a therapeutic and can and will depleat 02.
I'd also aerate vigorously after adding those meds. I also am a firm believer that most infections are best treated from the inside out. Cichlialhoics anonymous advice on the medicated food is sound, and how I've best been able to treat my fish. IMO dumping meds into the water without having a good diagnosis can make things worse instead of better. Watch closely and be prepared to do another water change( and add the carbon back) if things get weird. Good luck
I'd also aerate vigorously after adding those meds. I also am a firm believer that most infections are best treated from the inside out. Cichlialhoics anonymous advice on the medicated food is sound, and how I've best been able to treat my fish. IMO dumping meds into the water without having a good diagnosis can make things worse instead of better. Watch closely and be prepared to do another water change( and add the carbon back) if things get weird. Good luck