So I have my 180 with my two oscars some gold severum and school of silver dollars but ich just broke out over the past 4 days while I was away from home and it looks like it's just getting worse I need to treat the tank but I was wondering how? Is their any medication that would be good to use and how do I treat a tank that size. My main concern is that I don't want to loose any fish and it's already spread to my parrot fish tank