ick less tank

Drives me crazy last yr September I been trying to keep my tank ick free and I am having a such a hard time I don’t know what else to do start over bleach the system

I been struggling to have a ick less tank since January, I know the Symptoms scratching on the rocks due to parasites on their skin therefore I got a 71 gal tank keep them in qt for 80 days with cooper power June 1st I put them I see little dots on am 3 dots they’re not scratching on the rocks...