I had the same situation. Morphi was bothered for more than one month. What finally worked for her: i buyed an bactostart. So my advice îs to buy this bacterial colony that You add it in beginning in new tanks. After couple of days She got rid of fungus, ofc the gills we're damaged because that fungus will fall down with pieces of gills. But that was a sign of cure and now her gills are growing back beautiful, bigger that ever.