Hi all -- 1st time poster but occasional lurker before.
I've had fresh water aquariums for 30+ years, but have never seen this sickness. Hopefully, one of you guys can help.
In my 65 gallon FW tank I have a bunch of Black & White Tetras, a few Gouramis, some cherry Barbs, several Ottocinclus and 2 Plecos. Recently one of the Tetras got these red spots on his fins. The thing that's most weird about them is that the spots are definite lumpy growths, not just "spots" There don't seem to be any streaks in the fins.
Starting yesterday, I started applying infection dosages of Aquari-sol to the water, but obviously it's too soon for any effect. The tetra isn't an expensive fish, so I have no problem euthanizing it, but I want to identify the problem, so I know whether it's something contagious that I have to rid the tank of.
Here's the water test results from this afternoon:
temp about 72°
pH = 7.8 (a little high)
Hardness = 9° GH / approx 160ppm KH (about normal for my tanks due to hard water supply)
Ammonia = 0
Nitrite = 0
Nitrate = 5-10ppm
So...any idea what it is and how to treat?