Sorry, I may not have been clear. I meant lower the water level of the entire tank slightly below the overflow. Take the water out with the power off, both the filter area and the tank water level will go down, this is normal(with the power still off). When you turn the power back on the water level in the display will go up and the water level in the filter will go down and should begin spilling over. The key is NOT to have water connecting the filter area with the main tank when the power is off. When you turn the pump back on water will 'overflow' and spill into the filter area.
Did the rock drip water when you took it out of the box?
If it wasn't dripping water I would try and get your money back
. The whole point of LR is to get creatures (mostly worms and pods but sometimes crabs and other stuff) and various microbes
alive on the rock. Much of the macro life will die if it spends 12H out of the water. All the LR I ordered came fully submerged and the ones that didn't spent about 30 min out of water in transit from the LFS to my house.
Pic 1 looks like your basic bristle worm (good guy). If it is laying like that, my guess is that it is dead. Pick it up with tweezers, never your bare hand. They have spines like a cactus.
Pic 2, hard to say, could be a brittle star or a worm.