My rics and shrroms are 1/2 way up the reef under direct MH's and they open great. Have you attempted to move them closer to the light? Mine were under PC lighting until about a week ago when I upgraded and while they did open under PC lighting the difference under MH was dramatic.
Have you checked your mag levels? I was having a problem until I fixed my Mag level. Other corals didn't seem to care as much about the mag as the shoos. Now that my mag is right I have some of them that have had babies and the babies have moved to a spot with almost no light and in 8 weeks are the size of a half dollar.
Also they seem to be a little sensitive to higher levels of strontium.
Remember the economy is in the pits and so is just about every salt mix. Companies are cutting costs.
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