6 inch deep coral propagation tank?

That's pretty shallow even for "shallow" reef standards. Everything that has a branching coralite will probably over grow height wise pretty quickly. I wouldn't say you would have much success with anything other than encrusting or possibly mounding species. Cyphastrea, Leptastrea. For some reason zoanthus seem to be all the rage, they may do well in that setup.
 
The problem with a tank that shallow is that it's difficult to get good water movement since the area for movement is smaller, I have a 48x24x14 and those extra inches make an unbelievable difference in coral health.

The most important part to a good frag tank is to start with a solid amount of experience in keeping a reef tank. Since you've posted threads that you haven't started your first tank yet I'd focus on that first, and once you have healthy colorful corals growing well then it may be time to consider adding a propagation tank. In all honesty that will likely be about a year from now. You will thank yourself for waiting.
 
what do you plan on using for water movement? What do you WANT to grow in it? Live rock? Bio balls? Lots of questions you have to answer before getting a solid answer.
 
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