Backyard Aquaponics
A place to discuss aquaponics

My plants are not growing nice they turning into purple. On my aquaponics

Sounds like potassium deficiency

Purple is usually a symptom of Phosphorus deficiency and normally shows on the underside of leaves or in veins, but by the time the purpling shows up the older leaves will have looked unhappy for a while, ie: pale green or yellow.

Got any pics?

Hi William
More information needed
Ph of system
Size and type and age of system
What your feeding fish with
What have you put into system
Photos usually help lots

+1 on the additional information but I do think Mr Damage has it right, this sounds like a phosphorus deficiency.