| whole reefs, lagoons & shallow pools in some parts are exposed to air and dirrect sunlight for hours a day. even some inner reefs around the world are exposed to salinaty changes and temp fluctuation with fresh water run-offs! im in agreeance with dave on this issue, some corals can be supprisingly hardy! it comes down to addaptability. the problems arise with excessive adverse exposure, in the worlds current state we are starting to lose all the less hardy and addaptable corals to something simple like a few deg. over normal rise in temp! Thats a whole other topic!
as for the dips, if you make the effort to recreate the dip in every fashion to what there accustom to minus the S/G you should be fine! osmotic differences dont make things explode! the just provide the means to unsure its uncomfortable enough to ether bunker in or let go! and stevo coraline algae is like the hardest thing to kill when you've created a dosing equalibrium within your 4walls! your 2 min dip wouldn't even set-off a ripple!
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