Does this tank have a center brace? I think I would try just the t-5s first. 4 of them should be a lot of light. On my 46, I had 2x96w PCs and I had really good growth with out all the heat of a halide. I even had pretty good SPS growth. Anyway, you could add halide later if you wanted.... and if you have a center brace, one will cast a shadow.

I would say that hanging it on a sump would be bad just because you can get more effective in sump skimmers for the same price or less. Also, you would have to have a really tall sump which would be harder to work in. You can do it, but I don't think I would do it.

I had a float switch that would turn on a maxijet to pump water into the tank. I got it from SamIAm. I don't know where he got it from, but it worked great. I just had it suspended in the surface skimmer/bubble trap of the aquac and whenever the water level got low, it would get topped off from a bucket I had beside the tank.

Also, I had a CPR hang on fuge. It was great. I would recommend it also if you are going sumpless.

But there are a lot of things you should consider. If you are going to have a high calcium demand, I would definately recommend a sump. It makes dripping kalk a lot easier and less risky because you have more water volume. If this tank is not setup yet, you could get it drilled to make the sump easier to do.

I'm just going to be honest with you. I have had both, and a sump / refugium makes EVERYTHING a lot easier. I had people telling me the same thing when I was telling them that I was going to do HOB. I didn't listen and ended up pay a lot more for equipment that I could not use on my next setup. Just think about the big picture and what you are going to have to do maintence wise with your tank.

Bryan