Thanks for correcting me
I actually thought that its like a part of the ecosystem like cyanobacteria and hence they persists even after they are eradicated with the "fishless for 8 weeks" method. Like you know, life always finds its way :P
Anyway, so since my tank has ich (I am pretty sure a green clown goby bought it in the system -__-), if I keep the fishes healthy, they shouldn't have problem right?
And about the sixlines, will it heal itself over time? I hear mixed reviews on the internet and hence was looking if someone has a similar experience.