Just wanted to second what BickeyBammer said about the Coco. One of the advantages of growing in coco is that it is much harder to over water than in regular soil. If you read the bumf on the back of the bag it says that even when wet it maintains 23% air. Like he said, treat coco as hydroponics.

edit : also as far as I am being told, this applies to PH aswell. I have been advised to keep my PH between 5.8 and 6.5. Which is why I don't like watering with my 7.5 tap water. The people telling me this are people I know and I have seen and tasted the results they get.

Good idea adding "in coco" in your sig... I think I may steal this idea.