Hi againCustomer The white substance you mentioned is a fungus which is a secondary infection caused by the original condition Dropsy. I hope you followed the recommendations in my original post. The water change is very important. To get rid of the fungus I recommend a medicine called Fungus Eliminator. If you can't find the product then you may use another medicine as long as it is meant to kill fungus.
Please understand that you should be patient as a cure is not going to happen overnight. Apparently the fish has been sick for some time. So follow the advice
from yesterday's post and add the medicine that I suggested today. Just remember that it's best to follow all of what I've suggested and keep doing so for 2 weeks and once again please be patient. I truly sympathize with your wanting the fish to get better ASAP but it will take time. Good luck Lucy and please let me know if you need anymore help.