If this was happening to me, I'd change my carbon every few days and do a couple of 20% water changes a week. Make sure the new saltwater has been aged 24 hours.
I'd also check my powerheads for crud build up that may be hampering their regular flow rates and for the right positioning for optimal flow for the particular animals involved. We lost a bunch of zoo frags shortly after they were introduced in our tank a few months back. As it turned out, water flow to the areas where the zoos had been placed was not high enough for them. Now that I have increased water flow to those areas, the new and remaining zoos are spreading nicely.
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