Hello, look at the chart for GH nutes in the thread http://boards.cannabis.com/showthread.php?t=20155
you have to convert ppm in EC, knowing that if EC=1, there are 500 ppm, and from gallon to liter. That's easy. For clones or seedlings, i run an EC of 0.7, for 3 weeks plants, EC=1.8, and so on but look at the chart. Your values are too low IMO.
Fhydro