For watering how many days between depends on how much soil your water is holding. I water thoroughly, then water again when soil is almost dry. For the soil that we work with, its about every 2-3 days. Its my understanding that it encourages root growth to let the soil get dry so they have to work to find water again or something. Half strength nutes every other water sounds like a good plan. I think the plants will let you know pretty quick if they don't like it.