If you want to validate that there is algae growing you can raise your FC to 10 and Pool School - Perform the Overnight FC Loss Test (OCLT). If it passes you got lucky, keep FC at or above target. If it doesn't pass the Pool School - SLAM - Shock Level And Maintain the pool to get rid of the algae.
Sounds good, I'll do that tonight and report back. I'm not used to seeing crystal clear water and thinking that I may have algae present. I'm seeing now that what we CAN'T see visually is normally the most important thing when it comes to maintaining a pool. Thanks.