I would not try to heat a tank any larger than 8 gallons with a small 50 watt heater. The difference in price between a 50 watt and a much more usful 150 watt heater is not much. I'd check things out before I got a very small heater that may have to work very hard to do its job.
Something insignificant with a good heater.
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.
I am not sure of the question but an Freshwater Angelfish is sold as a freshwater tropical fish.
I've had many freshwater fish and room temperature seems to work. with tropical fish you may need a heater but not with goldfish.
Goldfish are freshwater, not saltwater.
They are tropical freshwater fish. They can be kept in an indoor heated tropical aquarium.
No. Danios are Tropical Freshwater fish.
No. Goldfish are freshwater fish and tropical starfish are saltwater fish.
Those are salt-water tropical fish not the freshwater fish you see in pet-stores.
no!
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.
Most tropical fish live in the ocean, but some do live in freshwater.
There are many freshwater tropical fish. In fact most of the tropical fish kept by aquarists are freshwater and they can not survive in either cold water or marine (salt) water. In most cases the marine species are much more difficult to keep and much more expensive to set up for.