Live Rock
Just like everything else living that goes into a reef system, live rock needs to be quarantined for a month. Any container will work. I don't worry about getting good lighting for rubble and base rock but I do want decent lighting on premium rock. In this case I've loosely stacked the rock with the premium on top. For circulation a rigid air line is inserted so bubbles percolate up through the rock from the bottom.
A baby Rose Coral. At this size they look similar to hidden cup corals but that it's growing on the top or sunny side of the rock and has some color indicates it's a Rose coral.
After a week or so I like to stick a hardy couple corals in with the live rock as indicators of how things are progressing. In this case I used a small duncan and red mushroom colony.
Back in the '90s my mentor owned a LFS with his wife and they always had multiple tanks just for holding live rock. Whenever he saw any sponge starting to develop a white slimy coating like pictured here he would not only aggressively remove as much of the sponge as possible but would go through all the rock in the tank and remove any foul smelling or even suspicious looking sponges. Over the years I've tried being lazy and just let thing run it's course but it seems to have led to more loss of additional organisms than I remember when I was working for him. For the last 2 decades when I QT live rock I'll start with 2 or three water changes a week (~10% - 20%), inspect all the rock closely and remove anything that looks slimy like the ball sponge in this pic or has a bad smell. Once I don't find anything to remove I'll switch to just a small weekly water change. Fortunately most cryptic sponges do fine with repeated inspection and scrubbing, and don't seem to be affected by the repeated exposure to air or if there are sponges close by that need to be removed. The best tool I've found for doing this is a flat blade screwdriver about 3/8" wide (partly because if my hand slips I won't be stabbing my self as deep like I would with a scalpel
).