I should also mention, you asked if you should feed them every 2 days or 6 days? Since you got the water soluable kind, that means you could be watering them every 2 days?
I think you should rethink that plan. It could lead to overwatering. The plant will grow VERY nicely if it goes through wet-dry cycles. A good rule of thumb if you should water it to saturation. If you have holes in the bottom of your pot (and you should), then water it until the water comes out the bottom. It should be good for 3-4 days atleast. When you can stick your index finger in the soil about 3" and it comes out dry, water them again. Soon you'll learn just by the weight of the pot, when it needs watering. Also, drooping leaves will indicate it. (drooping leaves will perk right back up after 2-3 hours from watering, so don't panic).
Don't overwater. Better to underwater. The plant will recover much quicker.