How long for "low tide"?

[justinl]

well although this is an arguable subject, imo as little time as possible is best. Coral reefs are completely exposed to the air on a regular basis for hours at a time due to the tides and are fine. However, I dont think i know many people in the hobby who wuold take that kind of risk with their own investments. If I were you, I would carefully plan out the move, and throughout the move, try not to allow long air exposures by basting the corals with tank water every ten or so minutes.