i got some melafix for my cory who has some fin problems. i put in the correct dose for the first two days. on the third day the tank smelled really funky. the melafix smelled strange enough on its own but the tank smelled like.....really salty water with melafix. i tested the water and the ph was strangely low, 6.2. i did a big water change and stopped the melafix. i also noticed my tetras acting strange, staying mostly on the bottom. am i supposed to have activated carbon in the filter during the treatment? i've also seen some people really hating on melafix on the internet, something about it clogging up fishes gills. what should i do?
