nitrated water

by Mike
(Australia)

I have set up an nft culture system to ad to my garden, I am running an Aquaponics system also, now my question is once the fish water has been through the bio filter as a grow bed, I have tested the water as it is returned to the tank but before it is reunited with the fish tank, the ph 6.4, nitrite 0.00, amonia 0.1 or less, and nitrate between 20 and 160 ppm my quetion is can I use this nitate infused water as is or do i water it down and do I need to add other nutiants to get the best for the my plants I grow watercress and lettuc. I hope someone can give me a solution as at presant I use it to water the garden when I change out a percentage of the fish tank water to try and keep it safe for the fish.
many thanks Mike

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