I had to put the seedlings under hid lightning because the t5 which were delivered with the greenhouse were too short and too high (some crappy plastic holder to put on the greenhouse). In my opinion a misconstruction. I did another construction with these tubes but they were too short. I would have needed 120cm. The plants in the periphery were just stretching. I am getting now a 120cm 8 bulb reflector with adjustable amount of bulbs.
Unfortunately it seems that the flushing had not a good effect. The plants are still dying, now it seems even a bit faster. Maybe I handled the small cubes to rough while flushing. Or they were too stressed and almost dead anyways
When I squeezed a cube with a dead plant inside I still got a ph of 7.8. Even when I flushed the cube several times.
Maybe it is normal that the plant increases the ph of the cube? So far it seems the ph in the cubes never changed. Even with flushing.
I guess this experiment is now finished. Have to start over. Didn't expect that hydroponics in the seedling stage is that unforgivable. Also I didn't expect that if I buy a product about which it is said in a book by a renowned grower that you dont need to presoak it, you will have wished to do otherwise. But who knows, maybe that wasn't the problem even...
I got some questions. I got now calcinit and epsom salts to do my calmag stuff. I still have some hundred liters of osmotic water around. The water is from last winter. Can I still use this water or is there some chance that the water is contaminated now in a way which will fuck up my seedlings again? Maybe I could add H2O2?
Also I am not sure if I still want to do rockwool if I need to presoak it. I got five ebb and flow tables. I wanted to do a perpetual SOG. What could I use instead, which doesn't create too much hassle with lot of plants?
Because I got a lot of rockwool around now, I am also thinking about just doing the seedling stage with something different than rockwool starter plugs and then transfer it 10cm x 10cm rockwool cubes and slabs that I got. Could that work? Can you recommend anything for the seedling stage? Maybe these coco tablets are good?