ICK in tank, Unsure of what to do

Good Morning,
I have a 95 Gal Cleair Aquar. Tank with LED lightning and 10 gal. sump. My Sump is a 3 compartment setup that goes from Bioballs to liverock to my return pump. We are currently fighting the Red Algea (treated with ChemiClean 2 weeks prior) and now I have lost four fish due to ICK this week. I didn't realize it was ICK till yesterday and treated tank with API Liquid Super ICK Cure. Below are my tank's current levels and any help would be greatly appreciated.

Salinity: 1.024
Temp: 82.4
Ammonia: .50
Nitrites: 0
Nitrates: 5
PH: 8.4
Hardness: 18 ( we are working on reverse osmosis to bring this down)
Calcium: 820
Phosphate: 5

Return pump is: AquaTop submersible 977GPH
Heater: Penn-Plex WarmTone 500 watt (said it will heat to 150 gal)

I currently have: 3 soldiers, 2 light blue damsels, 1 Neon Blue Damsel, 1 lawnmower, 1 Decorator Crab
Lost: Fire Angel, Clownfish and 2 black damsels.

Thank you So much for any help