You should be more than ok with the 6 bulber. I sort of have an addiction to them so I will warn you. For some reason they just get addctive

I have mine under an 8 bulb setup. You want to start them at the bottom of the tank and if you want to try higher, gradually move it up. I have chalices 5"-6" from the light and they love it but I also have those that hated the high light and will only do well on the bottom. As for feeding, like Nino said you can spot feed them if you'd like but it's not really a necessity. They will most likely feed at night. What I do is feed the tank with a bit of food and micro food early in the morning before lights turn on as everyone in the tank(coral wise) is usually feeding. Just make sure your parameters are ok and you'll be alright.