Hey Bert,
I am pretty new to the SW thing. Just switched my tank over 4 weeks ago in fact. I have a 47 Gallon tank and I just installed a new light fixture with a 250 watt MH, 2 actinic, 2 blue fluorescents, and blue and white led moon lights. WOW - It is bright!
I had a little trouble starting off, I thought my tank was cycled, but the LR I got from Ofishal was not cured and so ammonia levels spiked after I put some soft corals in the tank. I babied it with some ammonia lock, bacteria supplements and water changes and it looks like the corals survived.
I added my first critters the other day, 4 hermit crabs (two red leg, two normal) and one turbo snail. Everyone seems happy.
I am going to put up a post, tonight I think, with pictures of my set up an a few thanks to the people that have given advice. I will direct you to it when its up.
What are you running, what critters and fish do you have?