Looks like a pH issue and a tad mag def, to me. Every time the pH spikes on us, in RDWC, in a day we get the "claw". and As for the def, may just be the lighting in the pict. Jst my 2cents
Those temp unless coupled with very high humidity or overly dry conditions, don't seem high enough to cause concern. Did it spike much higher than 85?
Peace