What can i buy to help this plant get better. I am in the beginning of flower and one seems to have a calcium deficiency or nitrogen. Ones stupid and the other 2 are okish
Looks like you have lockout because you're suffering from a couple different deficiencies. Test your res pH and EC. I bet the pH has dropped to 5 or less, and your EC is sitting above 1200.
You need to read your runoff ph and ec levels to see where the problem is. Then you know what needs to be done. High ec flush low ec more food. Ph out of whack then fix that. Cheers friend