10 days ago I noticed one of my Phantom Tetra's had some strange dark patches on it. I thought it might be fungus so I treated the tank, but it hasn't helped matters. The patches protude from the body slightly, and one has a small white dot sticking out of the middle of it (visible on the left side image near the base of the anal fin). The fish still eats but seems a little twitchy and has gone quite pale. The patches can be seen clearly on both sides. Now I've noticed one of the other Phantoms has a very similar growth, only a little larger and concentrated around both sides of the base of the tail, with at least a couple of similar white spots (like the first it's still eating, although this one's not gone pale). The other four Phantoms are fine, but whatever it is I'm worried it might spread further.
The tank's cleaned out weekly with a 15%-20% change, last time I checked ammonia, nitrate and nitrite were fine, with a pH leaning towards alkaline (7-8ish). Temperature's 26 degrees, there's a very low concentration of salt (5 tablespoons for the whole 120 litre tank). I've had a fair bit of algae growing lately, and a few days ago there was a milky white bacterial bloom that cleared up in a couple of days. There's snails in the tank, along with Glowlights, Platys, Harlequins and three catfish, all of whom seem to be fine. I added an old piece of bog wood several weeks ago, nothing since then.
Help?
The tank's cleaned out weekly with a 15%-20% change, last time I checked ammonia, nitrate and nitrite were fine, with a pH leaning towards alkaline (7-8ish). Temperature's 26 degrees, there's a very low concentration of salt (5 tablespoons for the whole 120 litre tank). I've had a fair bit of algae growing lately, and a few days ago there was a milky white bacterial bloom that cleared up in a couple of days. There's snails in the tank, along with Glowlights, Platys, Harlequins and three catfish, all of whom seem to be fine. I added an old piece of bog wood several weeks ago, nothing since then.
Help?
