As Boon says “the worst thing you can do is nothing”.
To me it looks like a possible three issues at play. The brown tips “could” be anything from too much high intensity sunlight to too much water. The light green spots looks like a water issue, either too much chlorine or too high pH. And the tiny black spots looks like black spot. No pun!
^~~~daconil ? and RO wtr would be my first line of defense.