The smaller the size of a tropical fish the faster their breathing rate will be. The smallest fish will have the fastest breathing rates.
I think you mean without a heater but if you dont the temp for the average tropical fish is 19 degrees celsius to 30 degrees celsius. coldwater fish will survive with a heater if its at a low temp and so can tropical with a heater at a low temp.
The Lifespans vary depending on what type of fish you have, but I've had mine for 3 years
No, catfish is not a tropical fish.
Yes, it is bad to put tropical fish in with river fish. The river fish can make the tropical fish sick.
they live in warm water because tropical areas are warm
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.
no they are not TROPICAL FISH NO NO NO BLACK ANGELFISH IS
Yes, a siclet is a tropical fish
No. Tropical Fish required warmer water.
It depends on how big your fish are and what type of fish they are, its worth asking the person you buy the fish from. On average you can fit about 20 tropical fish in a 2ft tank.
There are millions of tropical fish in the tropical oceans. But they are all marine fish not freshwater fish. Freshwater tropicals can not live in saltwater.