Barbara;155247 wrote: If I were you I'd research the skimmers, lights and sumps. Melevsreef.com is a great place to learn about different styles of sumps.
For the sump, you need to decide if you are going to use part of the sump as a refugium. Many of us have refugiums as they are a place to grow beneficial algae, which will cut down, or compete for the nutrients that cause bad algae to grow (specifically, the dreaded hair algae!). If you have a refugium, you'll have to set up a way to light it for at least 7-8 hours per day to keep the beneficial algae alive.
If you go without a refugium, you'll have more room for the skimmer section and return section, which will be a plus in your set-up. (There's not much room under a 46G bowfront tank usually.)
As for lights, what you have now are "power compacts" (aka PC). They are perfectly fine for fish only, and also for softies, and also for some LPS. I have PCs only on my 20G in my bedroom, and all I have in there are 1 fish, zoas, xenia, kenya tree, mushrooms (all softies), frogspawn and a plate coral (LPS, or Large Polyp Stony). If you want more colorful corals, and also if you want SPS (small polyp stony), or the things that look like little colored sticks, you need better lighting. Your choices are Metal Halides (high energy consumption, but you can't beat the light they put out), or t-5s (a little more robust than your PCs). Or you could find a kit with a combination of lights.
For skimmers, I am an ASM fan. However, I've seen so many Octopus users on here, and from what I can tell, the Octopus is a little cheaper than the ASM, I would probably try one out if I was on a tight budget and needed more than just a skimmer. Definitely buy on-line, or used on this forum or Reef Central, but you should research to understand the value of each item. I did a lot of research on the protein skimmers before I purchased mine, and I was very informed when I finally made my decision.
Good luck with your choices and keep us posted on your progress!