well i flushed the cubes with ph 5.5 epson salt water, then changed my res(6 gallon) with 6 teaspoons epsom salts and 3/4 strength nutrients..... hopefully i will see a big change in the next few days...

Over 900 sounds awfully high PPM for tap water. You should get yourself a PPM meter - it is as crucial as pH. I have hard water (nearer 300 PPM) and use General Hydroponics Hardwater Micro base and then their Grow and Bloom.

But if your water is that high - you may want to try investigating reverse osmosis (RO) or some kind of filter that doesn't encourage salt build-up.

Well it turns out my ph was a little too low, i have adjusted it to be better, now the spots are kind of slowing down, im noticing on newer growth the leaves seem to be more yellow all around the leaves except for the veins.... im not sure if i should cut off all the spotted leaves as they still look kind of healthy and its almost all of ther bigger fan leaves that are spotted.......

ill try and get some more pictures, does anyone have any ideas?