It depends on par (usable light intensity) and flow. I suggest medium flow, and medium par of 50-150. Starting off at the bottom of the tank is usually suggested because it is usually the lowest par area, and will allow the new frag to acclimate to the tank. Depending on what your par and flow are, it can stay there, or be moved to the middle or top over a period of a month or two. The reason for starting low is because low par won't quickly harm a coral, but high par will, so par level changes should be made gradually.