This is not a deficiency. It's Nutrient bun.
Not real bad yet, but the plant is very sick and it will crash on you pretty soon if you don't flush it.
Take it outside. Turn a hose on low and run water threw it for an hour - 20 or 30 gallons of water.
You must get rid of all the exes salts in the growing medium. The plant has a case of reverse osmosis.
Water is actually moving from the plant roots into the soil due to the exess salts in the medium rather than the other way around.
You need to flush this plant and any other showing signs in order to save it. Do not wast time do it right now.
Your plant is very sick. If you don't, all the leaves will yellow dry up and fall off. The plant will shrivel up and die.
No amount of
Cal-Mag will fix this. Even with a real good flush the plant may not survive. But it's the only thing that will save it.
I killed a great plant last year. Got cooked and fed it twice. It took 2 weeks for all the leaves to fall off. It was not fun to watch.
Hope this helps you.
All the best Ron.
