If the combination of a dry environment and slow-wicking LECA leads to the evaporation rate significantly outstripping the LECA's ability to replace the moisture, there are a variety of alternatives you can use to improve things.
One is to simply water more often. Another is to top-dress, and sphagnum is a common choice (although I am a bit concerned that it will break apart, infiltrate the medium and clog things up). A poster to the S/H forum from Europe uses disks of aluminized mylar. Not only does it slow the evaporation rate, but he actually gets some condensation returning to the pot.
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