Request Help
Tank size: 48x15x18", but currently in a 3g quaratine (yes, with filter with mature media and a heater)
pH: 6.5
ammonia: 0
nitrite: 0
nitrate: 30ppm
kH: not sure, but our water is very soft
gH: " "
tank temp: 76°F/24°C
Fish Symptoms (include full description including lesion, color, location, fish behavior): I noticed last night that one of my glass cats had a pale yellowish mark on top of it's head. I had a closer look this morning ,and it seems as if the whole of it's head, on the inside, is one big spot; a nasty, pus-y looking creamy yellow with a hint of pink
What's worring me even more, is the same colour seems to be tracking down the fish's spine; reaching to just past it's stomach
It's still eating and swimming, and seems ok, in itself, but the other glass cats weren't letting it swim with the shoal, they kept chasing it away when it tried to join them. I've isolated it but have no clue on what treatment might be worth trying 
Volume and Frequency of water changes: 50-60% weekly
Chemical Additives or Media in your tank: None
Tank inhabitants: in the main tank, 10 other glass cats, 42 green neons, one angel, one BN, 13 hatchets
Recent additions to your tank (living or decoration): None
Exposure to chemicals: None
Digital photo (include if possible): Can't get a decent pic, I'm afraid
Tank size: 48x15x18", but currently in a 3g quaratine (yes, with filter with mature media and a heater)
pH: 6.5
ammonia: 0
nitrite: 0
nitrate: 30ppm
kH: not sure, but our water is very soft
gH: " "
tank temp: 76°F/24°C
Fish Symptoms (include full description including lesion, color, location, fish behavior): I noticed last night that one of my glass cats had a pale yellowish mark on top of it's head. I had a closer look this morning ,and it seems as if the whole of it's head, on the inside, is one big spot; a nasty, pus-y looking creamy yellow with a hint of pink

What's worring me even more, is the same colour seems to be tracking down the fish's spine; reaching to just past it's stomach

Volume and Frequency of water changes: 50-60% weekly
Chemical Additives or Media in your tank: None
Tank inhabitants: in the main tank, 10 other glass cats, 42 green neons, one angel, one BN, 13 hatchets
Recent additions to your tank (living or decoration): None
Exposure to chemicals: None
Digital photo (include if possible): Can't get a decent pic, I'm afraid