you should water when your soil is crusty dry, let the top of your soil get real crusty
^ to keep from over watering
also, rather than the looks of it, you can pick your pot up to check, if it needs watering
& if the weight is really light, you know, your plant is in need of some watering
as for the fert & nutes, you should give it to your plant, every other watering
^ if that's wrong, i'm sure, someone else, would gladly explain it, better to you
good luck