The medium is causing this,either through off ph ,salt build up or no nutes in it. Carefully transplant into quality coco and use hydro nutes both of which are designed to grow cannabis , you wont have a yellow leaf and they will grow quickly . The soil and nutes your using is just guessing and...
No your not screwed. The combination of the 400w hps and the drenching has drooped the plants and stopped them growing. If you get them under a cfl they will be back in 2 days. Leave them under the cfl for seedling stage, then under the hps raised 36" to start then lowered if you see no drooping...
You have not fed the coco enough or the right nutes. Try canna terra pro and feed canna terra vega every watering full strength as says on the label. Not a fair comparison. The coco is much better than any soil.
Most soils are not suitable for cannabis indoor and mg soil is one of them. Yellow leaves brown tips and spots all over. Try some canna terra coco professional or something similar made for growing dope ,its perfect. The soil your using is ok for veges or roses outside. Try to start with the...
You will have to exhaust or forget it. Use cheap pieces of melamine plywood as a door for the room so you can cut a hole in it and run ducting thru it, do the same for the window only make it shorter so the window isnt too far open , drill a couple of holes in the window sash and put a couple...