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It could be any biting bug honestly. Bed bugs are tricky to notice as well. Most people don't even know that they have them. Also, I don't know...
That looks like bed bug bites broski. How are you so sure that its spider mites?
Okay so after I looked at phosphorus def, I decided to go ahead a supplement them with Fox Farm Tiger Bloom 1/2 strength and 1/2 strength Fox Farm...
This is the leaf progression. It takes about 3 days for them to change completely.
The problem presents as small light brown dots all over the leaf affected, then gets darker brown and then begins to yellow and eventually falls...