Thanks Matt.
The SPS corals were the ones I was looking at and I was thinking about adding a clown fish, a Blue Tang and a Black and White Ocellaris Clownfish.
I really need to read up on these first though and what stages do I add the live rock and other things. Can anyone recommend a good website for this please or am I missing something on here?
Very welcome.
Good references for setup? Absolutely! See book link below!
For the record, I presumed the first tank you listed was 125 gallons, but it's 125 liters. The tank you just mentioned is even smaller.
If you are serious about that size-class of tank, you will have to leave tangs out of the plans for this particular tank. On the other hand, if you are serious about the Tang, then start considering larger (>120g) tanks now.
Personally, I wouldn't put a tang into less than a 72" tank. I would feel sorry for one going into less than a 48" tank for anything but a very temporary grow-out period.
There are tons of other fish in the sea... :neutral: <ahem.> ...to pick from if you're locked into this size of tank, so don't despair!

Just keep looking and find other interesting fish.
There are lots of
great SPS corals to start with. I wouldn't even hesitate to start the tank with some SPS corals and save fish for a little later. (Yes, I'm crazy like that.) Any of the orange/green/purple Montipora cap's would be great. Most of ORA's birdsnest corals. Green Slimer Acropora. That's a very short, sweet list. There's plenty more once you start knowing what you like and can zero in a little bit.
(The pic as my avatar is a "German blue" Montipora digitata and was my first SPS coral. Beautiful coral.)
Whatever you do
start slow. Only add one coral at a time with lots of space in between new additions to allow you to see if/when/how much change they start having on your water chemistry. You'll know because you'll be testing weekly until you start seeing changes in alkalinity and a little later calcium...then the fun begins. You're growing corals!
Googling the term "alkalinity" and reading everything you are able to on the subject pertaining to reefing is the next most important thing you can to to support yourself going into keeping stony corals.
Therobbo-There is a book I bought before I even started in this hobby.Its call the Conscientious Marine Aquarist by Robert Finner.This book saved me tons of time and money!And when people don't respond online right away,its a good go-to guide!It covers everything from buying an aquarium and setting it up to livestock selection and care.
+1 Great book. One of the canons of the hobby IMO.
Check out his
Wetwebmedia, Aquarium, Pond, Marine and Freshwater Fish, reef tanks, and Aquatics Information website as well.
It can be a bit much to take in the first time as it's a bit scattered and voluminous, but there's a ton of great info in there!
I think my favorite startup book is
The New Marine Aquarium: Step-By-Step Setup & Stocking Guide: Michael S. Paletta, Edward Kadunc, Scott W. Michael, John Goodman: 0097818900875: Amazon.com: Books
It's not expensive at it's cover price and you can see at that link there are very economical options available to acquire this book. I'd really recommend it. Covers everything from how and why to stack your rock, so the why's and wherefor's of picking fish. Lots of great pictures too.
Hope this helps!
-Matt