jelly fish
it comes out their bums and sits on the seabed/tank floor and decomposes
No. They are too weak to get along and they do not have fins so they can only stay at the seabed.
If you live in The U.S.A. using live fish except for guppies is illegal or at-least where I live. Other than that I really have no idea.
shelly seabed
Most fish can be fed fish food. If not they feed on algi, a bacteria that grows on the seabed and plants or the glass walls and bottom of a fish tank.
International Seabed Authority was created in 1994.
Do you mean will they mate with other fish or get along with other fish? They will not mate with other fish, but they will get along without tetras.
not most swordfish get along with other fish
Wader
If the seabed is destroyed, the coral cannot get nutrients to live.
I saw several conch shells on the seabed, but I didn't know if it was legal to collect hem.