Lights too high and too much N will cause stretching.
That's quite a stiff nute solution. Did you see tip scorch?
85'F isn't outrageous, but 60'F is getting on the low side. Try to keep temp differences less thatn 15 degrees apart.
Do you have some sort of aerator in your reservoir? That's a good thing to stick in there, even a cheap aquarium air stone and pump.