Sorry. You'll be fine with 15 - 16 " of water on top of a 4" sand bed.
Just make sure that you have room for water to drain on shut down (if water even settles in the fuge - it may not).
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150 gal Custom. Born 5/7/07. 50gal, 29gal, 20gal Sumps. 30gal Frag Tank. ETSS 800 Skimmer, Deltec APF600 Skimmer. PFO Solaris Lighting on Display and Frag Tank
My Tank Thread
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