Hey dude, based on the photos it is certainly plausible that this is heat stress. If youāve already moved up the light then this issue may rectify itself shortly. Itās often a common symptom of root issues too like binding or overwatering. Sheās in a 5gal so binding is unlikely at this point. If you find that the medium is always moist when youāre watering then try letting it dry out a little longer. Other than that, think youāve probably diagnosed your issue alreadyš. Good luck