White blob on Neon Tetra

[lynxfishy]

Hello everyone! I've had this neon tetra with this strange white blob on its side for roughly a year now, and I am unsure of what it is? The neon is the biggest one in it's school, is very active, eats well, and overall has very normal behavior. When I first saw this white clump I instantly quarantined the fish and gave him the med trio. Nothing happened. After a while the fish became very nervous without his/her school and starting to display signs of stress, so after 2 weeks of nothing happening I simply returned him/her to the main tank. None of the other neons have this, nor does my dwarf gourami. I am wondering if I should be worried about this? 

My parameters are as follows:

• pH 7.6
• Nitrates 0ppm/low range this is a very heavily planted tank but I do dose aquarium coop easy green once a week
• Hardness I believe I have hard water, around 150GH
• Nitrite 0ppm
• Ammonia 0ppm
• KH/Buffer low 40KH
• Water Temperature 76F
•  

 

Edited June 14 by lynxfishy

[Guppysnail]

That looks like an old injury that has healed leaving a scar. 
If he has had it for a year and shows no other sign of illness and all his tankmates have been fine this past year I would not worry at all. 

He does seem to have a bit of tail issue. That may be left over injury. Keep an eye on the other tankmates. As long as they are fine and he does not get worse it should be ok.