The tropical day is near to 12 hours as is the night. The nearer the equator, the closer it is to 12 hours per day and 12 hours per night.
72 legs A tropical fish has 72 legs
Tropical and brackish are not mutually exclusive. Tropical means warm, and brackish means somewhat salty. Many brackish fish ARE tropical, and many tropical fish are brackish. You can keep tropical brackish fish with other tropical brackish fish, if they have the same temperment and will not harm or eat eachother. You can keep some brackish fish with some freshwater tropicals, and similarly you can keep some brackish fish with some marine tropicals. There are no wide open set of principles for brackish fish compatability beyond those that I have just illustrated.
Tropical fish have many colors, so they can blend in with the colorful ocean floor. They have a swim bladder to control their bouyancy. Most tropical fish swim at 640 ft in depth.
there are many caterpillars and fish that are tropical herbivores
There are many tropical fish on the link i posted that should help if you click on the name you will also get a picture of what the fish looks like. Hope i could help.
Thousands.
There are many species of "Tropical Coral Reef Fish" that are commonly called "Butterfly Fish"
There are shark and tropical fish galore, but the Mahi mahi is the game fish of choice.
Crushed
Guppy's are popular tropical aquarium fish and don't have any legs.
Not all tropical fish even lay eggs, guppies, platys, and swordtails are good example of livebearer tropical fish. So the number of eggs a tropical fish lays cannot be determined.
Thousands of different tropical fish.