Hi,
I just downsized from a 100 gallon tank to a 55 just so I could do it right. So hope I can help you avoid a few of my mistakes...
If you want to see my full list of laments check my tank showcase forum:
http://www.reeffrontiers.com/forums/showthread.php?t=11670
Don't do the U tube siphon overflow. Many people get away with them but the ones that don't are so aggravated or in trouble with spouses/landlords that they are lucky to keep the tank. Get a "reef ready" 55 (brand name of drilled glass tank) or an acrylic 50 and have someone fix it up for you, there are many helpful people on this board. The RR 55 overflow takes excessive space up IMO but is very safe. Drilled tanks can be made silent, they don't stop flowing, and they restart themselves after a brief power outage. U tubes fail most often while you are asleep or on vacation and make slurping sounds, again usually while you are trying to sleep
. Even the expensive ones can cause trouble. Acrylic scratches like crazy and algae is hard to scrape out of bent corners, glass might be best, but that's up to you.
I am eternally grateful to Marty Finn for having Big T build me a sump for the 55. It's as big as humanly possible-takes up the entire stand and holds roughly 30 gallons. In the middle is a thriving refugium/coral frag attachment area. You can't buy a sump like this retail, they are usually too small and lame. Sump's just a box really, the dividers provide tons of support and it doesn't have to be pretty so you can build your own. My store bought stand from AGA has a vertical piece in the middle which is cosmetic and can be removed in the back to slide the sump in. Just don't make your sump wider than the opening
. Once in place we put the vertical piece back and the bowing of the sump will be somewhat prevented by the wood, a bonus. I think building a stand is better, the AGA stands are usually pretty ugly and the hoods don't hold halides if you decide to use those later. Building a new hood and matching the stain to the stand is really really hard!
I don't know squat about the skimmer you are contemplating, might have to design your sump and stand around it as I did in the past. Some are too tall to accomodate in sales floor stands.
Get a very strong return pump without too much heat if you don't have air conditioning, the more flow the better. You can put a SCWD (pronounced squid) on it so that the return flow alternates from side to side, creates a wave action and the softies not only look great in it but grow great. Don't use too many right angles on the tubing, the softer you can make any bends in the line the less flow you will lose. 1000 GPH is not unreasonable-most would say it's minimal-for a return pump. You can't do that with a lot of U tube overflows, but you can't really grow fat softies without flow and one solid powerful return pump is better than 6 powerheads, and cheaper in the end. Even then you probably will still put a good powerhead like a seio in there to eliminate low flow areas. If you are like me and learn from mistakes this will be after buying 20 or more cruddy powerheads/pumps
I use a box fan face down on the sump for cooling and a pair of heaters with a temperature controller as heaters seem to fail often. One heater was stuck on and the tank got to 85 degrees, it still didn't turn off but was set to 78. El cheapo temp controllers I use are 15 bucks at Angelsplus.com or $120+ for digital ones elsewhere. The cheap ones are easily bumped up or down, the knob is too flexible. Tape it down where you want it.
Lighting on my setup is 2 96 watt pc bulbs and I get afternoon sun which most people frown on. Would be better to get no sun and add 2 or more 55 watt actinics for color and dusk/dawn. Would love moonlights as well. If you build an enclosed hood fans are in order. Again the RR overflow cuts into the area where I'd like to hang an actinic. No point lighting the inside of the overflow.
Don't pile too much rock in there, you need to leave room for the coral. I saw where one guy recommended 1/4 to 1/3 of the bottom space should be rock, rest will allow room to grow. Softies need flow and space, and grow they do...fast. I raised my liverock on platforms of pvc pipe and eggcrate so the flow goes under and around it, this also gives the fish hiding places. Looks ugly til it's covered in coraline but works well. Also try to avoid putting rock against a wall of the tank. You don't want any dead zones. I try to create caves when I place rocks and generally keep the structure open to flow.
Use fine aragonite sand, no chippy stuff or crushed coral-that's for freshwater tanks. Traps debris like crazy, gets nasty.
Dose your supplements from the beginning and learn to use the test kits. This will ensure that the maximum amount of coralline survives on the liverock and the bacteria that cycle the tank perform better/reproduce faster. Plus it's good practice and teaches you how a tank can get out of whack without risking the health of fish and coral. A 2 part system is good for softies, they don't have to have a ton of calcium. I like to emphasize the alkalinity, especially with xenia. SPS people push the calcium up but we softie people don't have to do that.
Last of all do get a quarantine tank set up. Nothing sucks more than losing all your fish because you added just one more. The FDA is in the process of pulling our access to over the counter fish meds containing antibiotics, so we will have to take fish to the vet (as if vets do tropical fish). Now is the time to get used to prevention. Apparently they think we are taking the fish meds. I did meet one person who does that so apparently the rumor is sort of accurate.
Kate
PS The bit about the FDA and fish is here, 2nd paragraph. I have been reading vet articles, they are interesting. Nothing new on ich but lots on diseases I didn't know existed, like "Naso tang disease".
http://edis.ifas.ufl.edu/VM108