you say "coraline" but do you mean whole rock pieces or just parts...??
i've seen tanks that have some stacks of rock so tall in the tank that part of the rock, say about 1% of it, is out of the water, and there's no detrimental affects.
i received a box of LR from my neighbor in the last week. it was all removed from existing systems; but had sat out of water for several hours before i got it. i transfered all the rock to a plastic bin and filled the bin with waste RO water. that stuff was pretty stinky! and any time whole pieces are out of the water for hours at a time will lead to die-off. but if only a small tip/portion of the LR is out of the water, especially if it's only in a curing tub, shouldn't be a big deal.
i now have rock in a bucket with salt water and a powerhead (no need for heater--the radiant heat from the powerhead keeps the water near 80 degrees); last check the ammonia was still high (2.0) and the nitrates were nearly off the chart (at least 100ppt). so even though this rock came from existing systems, and was at one time fully cured, the few/several hours it was out of the water lead to enough die off for me to have to fully re-cure the rock.
for what its worth, i've typically "cured" any additional LR purchases from stores/hobbyists for at least a week before adding the pieces to established systems. just for my own peace of mind...
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i didn't cook anything either; i just baked myself.
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