Red slime is caused by old lighting, poor water movement, high nutrients, and poor water quality.
Locate the contributing factor(s) and improve/remove. Treat with chemicals and your water quality suffers. Unless you remove the contributors the red slime will return.
Also, eyes that show cloudiness can be from injury or poor water quality. Water changes often can help.
Also, if your red slime problem is chronic and widespread, massive cyano aka red slime die-off from the chemicals can cause MAJOR system problems.