They look great! And that is a good feeding plan!
I would try and find corals locally, either from other reefers or lfs. It gets really expensive ordering online because of shipping costs. But some good ones are Mr. Coral, liveaquaria, and a few others. Check out the vendor section to look at what other people thought of their online order. And i think doubling the light should be great for your tank and let you keep anything you wish.
And regular water changes will be more than enough to replace everything the corals remove from their growth. I highly doubt you will need to dose anything. But if you do decide to dose, make sure you are testing what you dose to 1. make sure you actually need to do so 2. prevent overdoses which can be very deadly.