L/K is prob the cause of said slime as it's organic .
As far as ph flux. in hydro = get used to it , I been at this for years and my res. still rises everyday . I use 3% h202 - a cpl. tsp. per gal. of res capicity to clean things up when neded . No clues when you can go bk. to the hyfrogard / hygrozyme - thats a product Weedhound uses . Maybe she'll pop up n answer this1 for you .
Peace
Crispi :jointsmile: