The first month for clones 1/2 to 2/3 strength is plenty if the water is ph'd correctly. I have found that after 30 days you can go to full strength every other watering without having any adverse affect on the plants.
If you are growing from seed because of the size of the plants 1/2 strength is plenty every other watering. After the first month or so depending on plant size you can step it up gradually to you reach full strength.
No matter what strength of Fox Farms nutes you use it is extremly important to ph the water correctly after the nutes have been added to the mix. If you do not own a Ph pen now is a good time to invest in one. This simple little device when used correctly will save you a ton of heathache no matter what nutes you use.
I know from experence about how much water my plants use per week and I will mix that amount in advance like on a Sunday afternoon, and since the feeding schedule changes form week to week that's about as far in advance that I go.