Finrot Moveing fast

[Opcn]

I did a 30% water change a week ago and twodays later I noticed that one of my zebra danios was hideing in a corner and had NO tail fin left. I moved him to quarenteen (a small tank with way to many snails) where we died after one day then I noticed his brother had fin rot goind to I added melafix but it keeps going I gave him a salt bath at ~1.025 for 3 min's but he was looking really bad in the saltwater so I pulled him out (belly up) What should I use?

Amonia and nitrite are 0 nitrate is low because I have done 3 25% water changes in a week and feed lightly, temp is ~82 Melafixing, added a bit of (kosher) salt (no iodine) 4 tsp in 10 gallons, ph at about 7.2.

Thankls for your help.

Opcn

 

[heresmike]

I'd recommend using Kanacyn. This should stop the rot. Melafix is good for helping to repair damaged fins and tails, but IME does not cure the disease.

 

[Sea_Monster87]

I've had good luck with maracyn for treating fin rot.