AsNoriuanswered grow question 2 years ago ph is the answer, when you added some nutritions, it changed plants acceptable ph
looking at plant size , you should already be measuring ph, otherwise they will grow like this, lanky and unhappy.
Buy aquarium drops with small range like 6.0-7.0 or something around
your target is 6.3-6.4 after adding and mixing everything or just plain, but ph adjusted to those numbers
Happy Growing !!!