You could get a betta fish but if you get one it would have to be in a different tank than any other fish (as many people know the betta would eat ANY other fish). You could get African Chichlids they are really pretty and social, neon tetras,glo fish.
some very cheap tropical fish are guppies, danios, white clouds, and many species of tetra can be very cheap. also, if you are just looking for any fish, not neccessarily "pretty" i would go with feeder guppies.
It matters. Most are around 3-5 inches. But some are pretty big compared to the average goldfish.
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.
It depends on the tropical fish. Some do have multicolored scales while others don't.
fish
because their fruity
Most tropical fish live in the ocean, but some do live in freshwater.
there are many caterpillars and fish that are tropical herbivores
tropical fish. Bigger fish and Birds. lol...
Try searching it on google, amazon swords are pretty hardy for aquariums
You can put some but not all cold water fish in tropical tanks for example you can put zebra danios and mountain minnows with tropical if you gradually increase the heat. You cannot do this with goldfish. It depends what fish you have.
No, catfish is not a tropical fish.