Mollies and black bettas.
Long thin black pelletts. It looks exactly like tropical fish poop
Possibly a Copperband Butterfly fish?
No goldfish would prefer to have a lower temperature than any type of tropical fish, however some goldfish can withstand higher temperature if they are slowly acclimated to it! But in the long run goldfish would be happy with other goldfish and tropical fish with tropical fish... there is a reason you don't see the goldfish with the tropical fish in a good aquatic store.
pirarucu, South American tropical Freshwater fish.
5 inches long 5 inches long
Viperfish are saltwater fish with long, needle-like teeth and hinged jaws. They live in tropical to temperate ocean waters. Their average length is 12 to 24 inches.
Betta fish can be from 2 to 4 inches long when fully grown.
A betta fish is anywhere from 1 to 2 inches.
About 10 year with lights and plenty of food
A few hours at most.
There are several fresh water fish that are 10 inches long, trout is a good example.
monk Fish are 2.5 inches long to the inch