I have a tank that’s been fully cycled for 3 months and today I spontaneously purchased some tiger barbs. I put them in my tank along with my other fish and I watched them for a good amount of time and noticed that one of them flashed one of my fake plants and then a few others did right after. Now I’m so concerned that I just introduced ich to my tank. I know I’m dumb for not quarantining them is it normal for tiger barbs to have this behavior sometimes? Please help.