What's up with my plants?

Plants look shrivelled with some rusting of leaves since they were repotted. I did notice one of plants roots were slightly brownish.

Big buddha cheese grown in coco with cana nutes. Ph 5.8 - 6.0. Temperature mid 20c. Humidity around 50%.

I've been using Canna nutes for nearly a decade now. Here's a couple of tips first of use a RO to filter your water this will remove your chlorine fluoride as well as your calcium. Then use Botanicare Cal-Mag starting at about 5 ml per gallon for plants this size. You're A and B should be at about 10 ml per gallon. When I transplant into 3 gallon or larger pots my A and B is usually at about 12 ml per gallon and my cal mag is at 8 ml per gallon. I bet if you give your plants a single dose of 10 ml A/b, 15 ml Rhizo, 0 ml Cannazym, and 6 ml of Cal-mag per gallon of filtered water they will look better in two days. If there is still a lot of moisture in your coco only give them about 500 ml of the mix do it before they dry out because the deficiency will probably get worse if you do.

=d

Phosphorus or Boron deficiency. Most likely phosphorus... and perhaps some overwatering. Never dealt with canna. Listen to growers.

-Grish