Oh...yes...the test kits...good call. Make sure to include calcium and alkalinity test kits along with the usual ammonia, nitrite, nitrate and pH kits considering this will be a reef system and don't forget the hydrometer. Trust me, with all the other stuff, it's really easy to miss the obvious...LOL. I'm much guilty of that one myself
A system that big, you could benefit from having a log book to keep track of test results and additives that go into the tank. Makes for easier troubleshooting should there be a problem.
Also something to highly consider with that kind of investment...a chiller, depending on where you live. If you have fairly hot summers, it will save your tank. Also fans built into the canopy will help.
I know someone with a 300 gallon reef. Gorgeous tank!! Have fun. I know I'd be in my glory with a tank that big.
We, as a people, know so much more about outer space than we do about our own oceans. This lack of knowledge can very well spell the dangers that lay in wait for us.
The oceans surely would swallow us before a rock comes down to smite the planet of it's life.