Short on Potassium?

One of the trace elements that aquaponics systems sometimes get short on is potassium, and Paulo thinks that might be why some of the leaves on my cucumber and strawberries are a bit peaky:

img-20160818-185700

Today I’ve started adding 10 grammes of K2SO4 per day — I’ll report back in a week!

A few more pics for reference:

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