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Yellow/brown leaves curling and dying

So mainly on my older leaves on my cukes, crooked neck squash and zuchinni the leaves are going just on the tips of the stem soft/limp and yellow to brown in the middle/spotchy and then shriveling up and dying. The system is about nearly 2 months old. I have 18 tilapia and water test below

ammonia o ppm

nitrite o ppm

ph 7.0 to 7.2 (just started bringing it down from 8.0ppm. Slowly over the last 2 days with muriatic acid. (leaves were turning beforehand.

Nitrates...color on test is deep red. So high level. I just added some maxi crop yesterday hoping today there would be no more leaves dying. I had cut all the others off and then same thing when I got off work tonight. Took some more off that had went limp and brown / yellow. Almost greyish from being dead. Actually it seems it not that I think about it some old and some new leaves. The ones I cut yesterday have already started coming back. No leaves yet but the stems grew like an inch today.

What am I missing. I put a few ounces of fish fertilizer in as well as it is nitrogen, phospate? and other nutes.

Help!

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Permalink Reply by Vlad Jovanovic on August 3, 2012 at 11:13pm

I guess since were sort of on the topic of buffers and non leafy green plants...A really good plan as far as a buffering regime would be to alternate/rotate between using three different buffers. Potassium bi-carb (for the K), Dolomitic lime (for the Mg), and then a 'regular' calcium based lime. This seems like it should go a ways, when growing plants with high Mg and K requirements. Many longstanding and experienced aquapons seem do this already (lest anyone should think it was just one of my whacky ideas :) ...