4 Fast Buds seeds Mars Hydro fce4800

Day 51 Raised Pots off the ground again to let the air circulate round them. Dropped attempted temps to 21 but its hovering around 23 with the light at about 65-70% and letting it get down to 18.5 with light off. Blue Dream continues to droop and look unhappy, shouldnt smoke before watering. Removed a few leaves from around the bottom of plants that were starting to fade, hoping due to lack of nitrogen in the soil but also showing what looks to be a bit of tip burn too....but its a new week and theyre still alive so thats something. Thinking tomorrow i may remove them from the tent and tidy them up a bit as noticed the stardawgs core is a bit of a jumble and dont want to risk rot Day 52 Actually last night I rearranged the venting , straightened the ducting, shortened it etc all to cool the tent down a bit more....added .5c to the heat....Like really ?? Theres more i can do but today was mothers day so been out all day and did nothing with/too the plants Edit - couldnt leave it alone and raised the light height but turned it up to 75% to see if that helps temps and if the plants look a bit happier Day 53 Moved and rearranged venting again , managed to get it set up to hovering around 23 at the canopy when the lights are on apart from that did nothing Day 54 Given up on the dang venting will lower the light and reduce the power again to reduce temps ....tomorrow.....update, tomorrow? whos kidding myself ? So lowered lights and reduced power and opened the venting on the side .......... gained another degree, going to wait and see if things even out otherwise I can remove the driver from the light and run that outside the tent...but knowing my luck thatll raise the fing temps too Day 55 Removed power brick, have yet to see an improvement in temps, did nothing else Day 56 Plants are yellowing badly, not sure if its due to lack of nutes cause ive only been giving them quarter doses or over feeding and lockout cause they said they would cope with zero nutes and would survive on just the soil. Anyway fed them, 600 ppm, ph 6.1 4ltrs 4ml grow, 8ml bloom, 4 topmax, 4ml heaven, 4ml algamic, 2ml cal mag....should have stuck to photos Day 57 Plants look a bit better...maybe ? more i look into it the more i think its an overfeeding lockout but its only really been low feed of 2-400 ppm