Why don't you post your tank in the Tank Specification forum and we can 'ave a look at what you've got.
What genera of SPS are we talking about, Montipora spp., Acropora spp., Seriatopora spp.... they might just be shipping poorly, I'm assuming you're buying them from the shops, correct? There are a myriad of coral killers that you really have no control over when you're dealing with wild-collected colonies.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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