I edited your font size and color...the small red just wouldn't show up. You gotta take it easy on us old farts with bad eyes
It sounds like you have diatoms which are a normal part of the cycle. If you have a good mix of snails and hermits (although you don't HAVE to have hermits), they will help with it. The diatom bloom will usually, assuming you have good water quality, burn itself out pretty quickly. 13 hours is about the upper limit on the light IMO
...you might dial it back to 10 or so for now.