All fish produce ammonia so all fish need their water filtered to remove this poison.The basic rules for successfull fishkeeping are. 1 inch of fish needs at least 1 gallon of water :- Every tank must have a permanently running 'cycled' filter. Every tank must have at least 50% of its water replaced every week. If you follow the above rules your fish will stand a reasonable chance of surviving. If you don't, then I can guarantee that your fish will be constantly getting sick and will die much sooner than it should.
Iridescent is the correct way to spell it.
The word shark in Spanish is tiburón.
Regenbogen
The correct spelling of the prehistoric shark is Megalodon.
Rayneboe
The type of shark is a mako shark (longfin Isurus oxyrinchus or shortfin Isurus paucus).
Shark (Chinese Simp.) = 鲨鱼 Shark (Chinese Trad.) = 鯊魚
un requin
Those letters spell rainbow.
Rainbow in Hawaiian is spelled as "ʻAnuenue".
un arc-en-ciel
Rainbow.