This is an old thread mob' me old mate. Not sure that guy's still around. You'll note that it was the ph he blamed in the end.
If your plants look like his, which to me look like a deficiency, or at least the plant is struggling to uptake nutes.
You'll also note that he started feeding full strength nutes to begin with. This caused a lock out of nutes through a build-up of unused nutes. Hence the lock out and the resultant deficiency. Nute def' and Over nute are really hard things to call.
The best thing for you to do if your plants look like this, is what I told you yesterday. Flush through the cubes to break down any nute build-ups that may have locked out the ph in your cubes. Adding more nutes only adds to the problem. I realise you were feeding low strengths, but the frequency of your feeds has built to such an extent where you have lock-out in your cubes. Of course, it could also be that your plants simply haven't got enough nutes. What colour are the leaf stems? Are they purple or red?
When you buy nutes from a shop. I wouldn't recommend ever following the instructions on the back unless you have paid for quality nutes, and they provide a feeding chart. I know advanced nutrients do it, and foxfarm... although AN is the best... and takes an initial investment into the nutes. After that you just buy the odd thing when you run out. Advanced Nutrients are based in Canada.