Backyard Aquaponics
A place to discuss aquaponics

Sounds fine as it is Russell, instead concentrate on getting more feed (good quality) into your fish, so long as your system has matured.

Russelprince, you have great PH readings, right in the sweet spot. LEAVE THE PH ALONE!!!

What you have is probably an iron deficiency and the system could use some sort of foliar spray for immediate uptake. Chealated iron (the kind that will disolve in water), and some Maxi-Crop spray more than likely will do what you need it to do.

Take it easy on the cheleated iron. What type of food are you feeding, what have you for grow beds, fish tank size, media, etc...?