Ich is not always present. UV ONLY kills the swimming stage. Not all get pushed through your UV. It can help keep the numbers down. Ich is a parasite. It is not like an infection. It is caused by stress because the immune system is lowered thus allowing them to attach. You only get ich if you introduce it.
No offense, but if you aren't sure, I wouldn't spread it. This rumor has been around for a long time and it has been proven plenty of times, that ick is not some disease but a parasite. And it does die off without a host. The reproduction cycle is know to be approximately 4 weeks. However, depending on when the eggs were hatched, it could be up to 6 weeks.
I would recommend doing some research on it.
No offense, but if you aren't sure, I wouldn't spread it. This rumor has been around for a long time and it has been proven plenty of times, that ick is not some disease but a parasite. And it does die off without a host. The reproduction cycle is know to be approximately 4 weeks. However, depending on when the eggs were hatched, it could be up to 6 weeks.
I would recommend doing some research on it.