Depending on what you keep in the tank with it you may want to think of a cleaner fish or shrimp and maybe even a UV sterilizer if you don’t already have them. My wife’s 75gal FOWLER used to get a break out about once a quarter till I got her a UV sterilizer and that cut it down to less than once a year, around November when the temp would start dropping. Two years ago we got a cleaner fish or shrimp for each of our tanks and that cut the ick out all together haven’t had any trouble since. If you go with a cleaner fish just brace yourself for the first time it goes half way into the other fish gills its quite an interesting sight. In addition to ich they help with all sorts of other fish cooties I used to see.