Help please, yellowing and holes in leaves PICS

This has been gradualy getting worse over the last couple of days. Hope its not bugs.

These small clones have just been put into hydro feeding half strength vita link.

ph is fine.

Humidity has been an issue though dropping to 20% sometimes.

Anyway heres the pictures.

Pictures now

type of light and how far away? temp of room?

you mentioned low humidity levels; humidity doesn't exactly become an issue until flowering.

as long as it's kept under 50%, i think you're fine.

what type of pellets are those, by the way?

never done hydro and just starting growing but by any chance did u spill nutes on there?

They are just normal cley pebbles.

They are under a 600w and it was about 2 feet away moved it up now.

temp=20-30 degrees

Dude seen this thing before!! Thats definiately a nute issue, they still look small so should be too much of an issue just cut right back on the nutes dude!! hope this helps