i'm no expert, but why is "drop and plop" preferable (less stressful?) than mixing shipping water 50/50 with tank water and hanging in the tank for a few hours? I usually leave them for 8-12 hours. My logic was that this makes the adjustment less severe, dilutes ammonia/replenishes oxygen in shipping water, and allows temp to equalize. Does this just result in the critters adjusting twice, rather than once via drop and plop?