yes
No. They move about the ocean.
You can not get rid of jellyfish, they have been in the ocean forever. They are here to stay.
=yes but not all of the pandas stay in one place.=
so they cannot be spotted by any predators. they are also transparent, witch means the jellyfish is camouflaged. some aren't so transparent. the box jellyfish is quite colorful. some jellyfish are still because the current takes them with it such as the mediterranian jellyfish. the Enchanted Jellyfish is a very colorful creature. so most jellyfish are very active but some are lazy current users.
yes it does stay in one place
Black lionfish stay in place
Plants stay in place by anchoring themselves with roots.
When there are too many at one place at a certain time, then yes, of course. Jellyfish "sting" people and too many jellyfish near the shore of a beach is bad news. This is why some beaches close at certain seasons (there are too many jellyfish)
no
as long as they want
For never.