This leaf is not exhibiting a magnesium issue. A leaf does not tell a story. We need to see the whole plant to give advice. Where ‘damaged’ leaves are on the plant matters.

@j-r-tokin has only bred with his wife. No plants yet. 😜

He does sell clones though.

Leaf deformities tend to to be caused by some type of root stress brought on quickly. Typically from an out of range pH or root pests.

Water temperature and O2 levels. High water temps and a lack of oxygen cause Pythium.