Black Shark fungus, then stress.
I have a Black Shark (Labeo) for about 3 years. Living in a 40g tank with 3 other goldfishes. 4 days ago, I noticed he seemed to have fungus so I gave him pimafix now he seems stressed. Today before I put the daily dose of pimafix, he was doing okay but a little lethargic and sluggish but when I added more, There was more stress symptoms. Should I add the pimafix for the full 7 days as prescribed?
Edit: While I'm posting this, I have a question about its food diet. Research says it needs to eat vegetables, but what kind?