calcium is what corals use to build there skeleton structure not sure about how they eat, pretty sure you still feed them, more of absorption though (dont take my word)
dont have my tank set up yet getting it going if you look at my tank journal but i understand some of it

hope you've come across the Nano contests (one here) and there's been a couple of others, if haven't, just type in nano contest in the search. Lot's of ideas.

Most corals have a symbiotic algae living in their cells that provide them food. You don't necessarily have to feed them but they do get a lot of benefit from being given something from time to time. That's the reason why lighting is such an important element in a reef aquarium.
An overflow is a part of your system where water from your main tank gets transferred to your sump.
Anyway I don't know what I said either I was just typing what is popped into my head at this very moment reading this thread.

Thanks all! I went to Aquarium Illusions Inc today, was very happy with how helpful the staff was, also I think the owner gave my little ones candy. I had alot of questions answer. My poor hubby was so bored. But I learned a little on what pump I would need and about how soft corals eat... and the baby hermit crabs are SOOOO cute!!!

A little update:
I've PMed a member on Albertaaquatica about a 30 gallon tank. His price is good. If I get it then its a head or tails as to if I use it for the nano or if my goldfish babies get it and I use their 20 gallon. Yes my 4 goldfish are my babies, them and my 5 guinea pigs LOL.

Yes I have alot of very interesting tanks.

your a pet freak :p just like me, freshwater tank, salt tank, cat, dog, dad.

LOL thats nothing! I have my goldfish, my planted white cloud tank, My guinea pigs, my dog and my African Soft Furred Rat. I swear if it wasn't for the fact that we rent I would probably have ALOT more. When we buy a house in a few years we are looking at a 5 bedroom so my piggies have thier own room LOL.

wow!

LOL yes thats one way to put it. My husband is a very sweet man to put up with all of my pet luvs. I love to cuddle on the sofa with my piggies, and he has to sit on another sofa or the chair... poor guy!

Still haven't heard anything on the 30Gallon yet.. but it hasn't even been 24 hours yet. I hope to know in the next 48 hours.

My husband is a commerial Electirian, and after looking at lights for my tank he has said and I quote, "screw that! I can build you a light for alot less then that"

So for Zaos and Mushrooms (which at this time is all I plan on getting for now), I should Need 1 10,000K daylight and a blue coral light right?