Melatse Bristlenoses

I got a few adult Bristlenoses in a tank hoping they would breed.
Then i saw one that looked badley wounded a while ago. Sortly after she died.
Since then i noticed that the other ones got like "malaatsheid" seems that their skin is roting a while. they got holes and bad spots all over them i tried some general medicine for skin diseases and anti ick but tonight i found 2 dead again.

Whats going on and how can i treat it, before i lose them all????

 

For a diagnoses please post a Picture, your current setup description including water parameters/ornament and a history of the fish will help.
Please stop using "general medicine for skin diseases and anti ick ". Any try just do Water changes for now.

 

Got them out a comunity tank from a old lady used same sand substrate witch was in the tank of hers in my tank.
3 or so pieces of wood couple of stones and some plants.
Also in the tank are 4 large gouramis and a load of krib fry.
Not all of the ansistriss have this disease.
A pic will be hard cause my camera is at a friend.
temp at 28 and a couple of days ago the ph was at 7.4 about???

 

from the limited info given - all I can say is :
1.Make sure no one is biting him/her, bulling, territory disputes etc.
2.Ensure lots of caves, and hiding spaces.
3.Ensure no sharp edges to that will hurt them.
4.feed at night when lights are off
5.Drop temp to 26'c, ensure the heater is not burning them.
6. keep water quality up.
7.move the fish to a hospital tank
8. any meds used need to be for scaleless fish