Please help major leaf problems pics included

Hello,

im growing in coco using the standard cana nutes im 3 weeks into flower and i think i have a number of deficiencies??

Please note these problems are all over the plant they are not specific to the top or bottom the picture where theres like half the leaf missing or as if something has eaten it is mainly on the newer growth.

hopefully someone will take one look and say i just need to feed it more i flushed it this last week because i was worried i had a salt build up because a lot of the leaves seem to be very dry and brittle

I really don't think its a major deficiency, if anything a little calcium and magnesium would do the trick for those spots. But overall the plant looks great man. Don't over love these things, they die when you do. I learned that the hard way. Good Luck my friend

Ah okay but 90% of the newer leaves are all shrivelling away and the leaves look like their being ate but theres not a single bug on any of the plants

IMO- Phosphorus Deficiency.

Good Luck on Your Grow

https://www.icmag.com/ic/showthread.php?t=11688 this is a great place to start!!

Catapillars/grubs. Put there by moths. Put the plant up to eye level and you should find it somewhere on a stem, near the damage. Sometimes very small.