Marcus, I've heard.. that lava rock can be heavy in Iron, just something to keep in mind. You may be best to ditch the lava rock and buy a box or two of base rock from J&L, it will colonize fairly well. With that base rock and the live rock you've got, get some pods etc from the LFS and you'll be well on your way.
Starter corals, well, I'd say colt corals, Xenia, Anthellia, some of the leathers. Your lighting plan sounds great, those 250s will be nice for the clams, I just heard that the bumble bees aren't reef safe from Jack, I didn't know that so like Emily says, ... ditch em.
Additives, I like Kent and Seachem but, some people don't, it's a personal taste thing I think. I'd not add additives just because someone tells you to though, test your water often, until you've got lots of hard corals you're Ca Alk shouldn't change alot. If you do find your Ca and Alk are being used up I like the Kent Liquid reactor, it's a single bottle two part and it works well and is easy to use.
Doug
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