Yes, that skimmer is made to sit in a sump as most are. Its a good skimmer no doubt. Very quiet too which is nice.
I think you misunerstood my post about lighting. I was kidding around by asking you to add some T5 bulbs to your list because I am due for replacements
. Sorry to have got your hopes up. If I had a lighting system to let go, I would though. Lighting, while very important, can take a back seat for a while. You can use any old light just to have some fish but you don't need any light to cycle the tank or for live rock period. Lighting is changing all the time. Lots of options from T5/LED retrofits to full fledge light fixtures with all the bells and whistles. Were you looking at the marineland "reef capable" LED fixtures by chance?
Do youself a favor and don't buy a sump. Manufactured sumps are expensive. Any tank will do. I am thinking a 55 will fit under that tank in the stand but just try and get the biggest sump you can (a sump does not have to sit under the tank BTW if you have another option). Petco runs a $1 per gallon sale (up to 55 gallons) which I think is going on now. Otherwise a used tank is perfectly fine as long as it holds water and hasn't been exposed to anything that could harm you livestock or bacteria. Once you determine your tank size, measure the inside dimensions and have a local glass shop cut you however many pieces of glass you need to create the design your looking for. Height wise, have the glass shop cut the baffles as tall as you can but still allowing enough room in the sump for it to handle backsiphon water once the return pump is turned off. The advantage to cutting the baffles as tall as you can is to allow the maximum water volume in your system. Your skimmer will have a designated water height that it should be placed in. So say your skimmer is desgned to sit in 8" of water. If the baffled area that you earmarked for your skimmer (usually the drain line area) is taller than 8", all you need to do is build a cheap PVC stand to siet the skimmer on at the correct height. Something to look at in terms of sumps/refugiums...
http://www.melevsreef.com/allmysumps.html
To get water to the sump, I highly recommend an eshopps or better yet a lifereef overflow box. The boxes that require a siphon pump scare me to no end. You do not have to match up your return pump to pump exactly what the box is rated for (you'll read that from time to time). In fact I suggest you get a pump that is rated higher than your box is capable of handling and put a gate or ball valve (plastic of course) in the line after the pump's output. Eheim, tunze and sicce are my favorite pumps but a lot of people use mag drive pumps. You should be able to buy a new pump for that tank for <$100.
If it were me I would buy the sump/materials, overflow box, return pump and plumbing first. RO/DI filter 2nd (unless you are buying water from your LFS) followed by your rock and sand to get the cycle going. Once the tank is cycling, work on getting some powerheads. Vortech and Tunze lead the pack but koralia and maxijets are popular (and cheaper) alternatives that people use a lot. Powerheads are likely the thing that hobbiests buy twice (or more) because they underestimate their flow needs or how important flow is. Just don't skimp on this even if it means you have to save up. IMO/IME Vortechs and tunzes are worth the cost and if you can find them used, even better.
Don't worry about dosing for now. You are a loooong way from needing to worry about that.
.
