Welcome to Reef Central, nwm!
It sounds like you've learned a few things about running aquariums from your freshwater experience.
A broad range of aquaria are covered under the loose term "reef aquarium".
There's a few basic things to consider when setting up any reef type aquarium:
anyone considering starting up such an aquarium should do some thorough research before taking the plunge. You can't just add "Reef Builder" to any marine aquarium and expect to have a reef aquarium. (You need to understand why you should or shouldn't be adding a product like "Reef Builder".)
It looks like you've found a good place to do some research. You can save yourself a
lot of time, money and frustration by making the proper choices when initially setting up your reef aquarium.
Since reef aquaria have many differences from freshwater or FO (fish only) marine aquariums, I strongly suggest checking out the 'new to the hobby' reef aquarium forum on Reef Central. There are lots of good articles located over there if you check out the links.
Here's a link to one such thread in that forum:
http://www.reefcentral.com/forums/showthread.php?s=&threadid=1031074
real. artificial, or artificially real? My 225 gallon reef aquarium.