1 month into my Headband Hydro. Running into problems.

Headband has been growing in hydroton drip system for a month now and it was doing fine in the beginning but now I'm seeing a lot of discoloration and "canoeing" of the leaves.

pH is 5.8
ppm around 400 (it keeps going up which i heard means that im using too much nutes)
room temp is almost 80
was feeding on 4 30min cycles just switched to 8 to see if it would help.

Any suggestions/comments much appreciated

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