Cyano deaths?

[Murminator]

OK about 3 weeks ago I had red cyano pop up in my 90 FOWLR 1st time I had it. Small little patch syphoned it out next day back little bigger did same with small water change with tap water. Over the next few days it was getting bigger and bigger suck and bunch out and 10G water change. My mother in law got real sick and was admitted to the hospital and we had a few round the clock nip and tuck days wife was staying at hosp I was running back and forth feeding fish and taking care of dogs. The cyano exploded it was everywhere now that things was under control at home I tried turning tank around with big water changes changing carbon nothing worked. I turned to chemical Red Slime Remover no removal of carbon, no water changes increase O2 recommended. So I added the appropriate amount 2 days ago and added an airstone yesterday red slime gone water cloudy but my coral beauty was swimming paniciky but still ate, everything ate. Today come home from work late only 2 out 10 fish to be found 1 not looking so good 1 fine, found 3 bodies. Did a 50% water change water very cloudy fearing the worst.
Anyone know what red slime remover does?....I'm guess it depletes O2 and thats what killed my fish or was it just the chemical itself?

Casualties
1 coral beauty MIA
2 yellow belly damsels 1 found 1 MIA
1 mandrain found
1 lattice butterfly found
1 neon dottyback MIA
2 clowns 1 not doing good 1 MIA
1 filefish seams to be healthy happy and eating

Tomorrow i will start pulling rocks to remove bodies