why does only one of my plants have light yellowish spots?

why does only one of my plants have light yellowish spots? i try not to underwater or overwater. whats the best drainage and aeration for indoor soil grow? how can i tell what my plant needs? i have 2clfs getting 4 more asap also an led panel and want to add 2 more of them as well. all wisdom is greatly appreciated. :peace:
 

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