So a while back some of my neons had suspected neon tetra disease/columnaris. I euthanized the affected neons and all was good for 3 months until I noticed a white spot on one yesterday. It doesn't look like Ich at all and I read a similar thread about how the neons had the disease and DoubleDutch said it seemed like a virus. I'm starting to think thats what it is because all the neons that have gotten it would still eat and were active. The ones I eventually euthanized lived 2-3 months and were still eating and active. Its only affected my neons, no other fish have been affected. If I do euthanize the neons would I be able to get another type of tetra or will they become affected?