The yellow fish who claims he is "obnoxious" is Tad. The fish that is paranoid and is a purple/yellow gradient is never named in the movie, but he is mentioned as Gurgle in the credits. The one in the tank that likes bubbles is Bubbles.
Tad
JACK
Clown fish-Nemo Royal Gramma-Gurgle Porcupinefish-Bloat Yellow Tang-Bubbles Starfish-Peach Moorish Idol-Gill Pacific Cleaner Shrimp-Jaque Blacktail Humbug-Deb(and Flo) Brown Pelican-Nigel
Her name is Deb. She has a "sister" Flo.
Her name is Coral and she is a clown fish.
Dory
Grugle, a Gramma loreto (Royal gramma)
It doesn't have a name in the movie. It's an anglerfish
Dory is the name of the fish with the bad memory in Finding Nemo. If you go to Wikipedia, or the Internet Movie Database, or Google, and look up Finding Nemo, you will find the answers to many of the questions you are asking about the film.
the yellow fishes name is fluffy.
Dory
Tad
JACK
Clown fish-Nemo Royal Gramma-Gurgle Porcupinefish-Bloat Yellow Tang-Bubbles Starfish-Peach Moorish Idol-Gill Pacific Cleaner Shrimp-Jaque Blacktail Humbug-Deb(and Flo) Brown Pelican-Nigel
Her name is Deb. She has a "sister" Flo.
Yellow fish is - Adolphus, Green fish is - Gustavus, and Purple fish is - Mercurius
Her name is Coral and she is a clown fish.