Yeah tons of variables. I didn’t know they had issues with Ich, I just love the way they look and the algae eating is a plus.True, at the end of the day it's hard to determine what is right. That being said, I'm sure it's easier for most reefers to keep certain types of fish healthy in certain tanks vs others. Smaller tanks require more frequent water changes with the same stocking for example. I've never kept tangs, but have been told they are ich magnets etc... there are a ton of variables.