The end of leaves are burnt and there are some marron pois, I think it's ph fluct., but I don't know how is possible because I only added solid fertilizer and water on the last 5 days. The edge of every leaves point up like claws. Help pls. Tnx
I would say salts building up in your substrate from excess feeds. Chèck your runoff waters ph and ec, to figure which one or both, is causing the lockout. Always figure out whats going on before reacting..
Calcium deficiency, make sure that your pH is within the right range and not too acid. And if you did not add a cal-mag supplement then I would recommend to do so! You do not need to give the cal-mag with every feeding but once a week is recommended. Enjoy your grow!
They seem cold. Shouldn't really go below 26c. The spikey edges look like a trait of the cultivar. You can back off the nutrients and just use water for a week if the burnt tips bother you. Just means you are giving them higher levels of nutrients than the plants can take.