yes
African cichlids, barbs, livebearers, synodontis catfish, loaches, cichlids, tetras, mailed catfish, labyrinthfish, and rainbowfish.
It depends on what type of tropical fish you are intending to keep; it ranges from 6 (freshwater & discus) to 8.5 (for cichlids).
In the wild, African Cichlids eat plants like blue-green algae and organic detritus. These plants are high in fiber, but provide little nutritional content, so cichlids eat continuously to maintain their metabolism.
Most livebearers are tropical fish. They can mix easily with most other community type species including Tetras, Danios, Barbs, Anabantids, Corydoras, Dwarf Cichlids etc.
Tons of purple fish are tropical! many cichlids are purple, and a few Betta are too!
Rams and other dwarf south American cichlids are reasonably peaceful, and should be kept with other smallish, peaceful tropical community fish. They are more sensitive to water conditions, so it will be easier to keep them with other fish that prefer soft, acidic water.
some names/breeds of tropical fish are mollys a larger fish from a range of courloursguppies smaller fish but males hane large back fins neon tetras small blue and red fish tiger barbs black and orange can be agresive sword fins a same size as a guppie but males have longer tales at the end then females fighting fish agresive but beautiful fish coulours are red and blue angel fish small or large can be agresive colours range gouramies larger thin fish usaly white or green and purple strips calm fish depends on the breed
Rather than give you "species' I'll give you "Groups of fish that contain certain types of species.". Good commonly available fish usually available at the local pet shops. Tetras, Anabantids, Dwarf Cichlids, Rasboras, Livebearers, Catfishes, Algae eaters, African Cichlids and South American Cichlids. All the above are tropical and some are very specific in their water parameter requirements.
no
Neal Pronek has written: 'Hermit crabs' -- subject(s): Hermit crabs, Hermit crabs as pets 'Tropical fish' -- subject(s): Tropical fish, Aquariums, Juvenile literature, Aquarium fishes 'Oscars' -- subject(s): Cichlids
Bigger fish
Cichlids are fish from the family Cichlidae in the order Perciformes. Cichlids are members of the Labroidei group, as are wrasses, damselfishes, and surfperches.