Laughing Buddha

Transplanted all plants from small pots into their final 9L pots. Looks like they took it well and are growing each day a little bit. Last two times i watered without nutes since run off water hot too low ph. Next watering will have nutes again. Lights are set at 60% intensity. I would like to increase to max but temps are already too high with often times 30°/86F. When temps get that hight i often spray some water around inside the box which brings temp down to about 27°/80F and up's RH from 50 to sth between 60 and 70. doesnt last very long though.. maybe i should get some sort of automatic humidifier?