If it had been awhile since you added bleach, then yes, you probably are on the verge of an algae bloom. Especially with water temps in the 80s. It doesn't take long. You have to be very diligent about testing and adding bleach consistently. Pool water is not very forgiving. Even a short time with the chlorine dipping too low and algae can start.
Most bleach is sold in 121 oz jugs, not a full gallon. One of those jugs in 10K gallons will add about 7.8ppm. Each quart will add about 2ppm. Use those values as a reference to help you figure doses.
Run your pump 24/7 and go ahead and take your chlorine a little higher.
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