Is my reef in trouble?

[Aquattro]

Yes, it looks bleached which certainly can happen with over heating. Try running lights at night when it's cooler, frozen water bottles as suggested, fan across sump or surface of tank. Ca is a bit high, not sure how it got there, but I'd aim for under 440 max. Alk looks fine. Salinity is fine, so that does point to heat as the issue.