Gourami Has Open Wound

[brittani299]

Hello. I have a gourami that has a big open wound on his side. It started as a small wound and I thought that he got it from one of the fish but it has been getting bigger. He is acting normal and is eating fine. There is nothing in the tank that can causd him to have this wound. I have been putting aquarium salt and stess coat in the tank to see if this helps and it doesnt seem to help. I havd also changed the water 50% once a week for several weeks now.
It is a 10 gallon tank and I have 2 gouramis and 1 australian rainbow fish. The temp is 75 and the ph and everything is fine. Does anyone know whats wrong? I dont have a second tank to put him in so everything I do will have to be in the main tank. Will add pics.

 

[brittani299]

It wont let me add a pic but I have one in the emergency section with the title big open wound please help.

 

[Ruskull]

It wont let me add a pic but I have one in the emergency section with the title big open wound please help.

I'm no expert on fish meds but I've used API T.C. Tetracycline, sounds like your fish has open sores and this stuff is made for bacterial infections.........