You can but it will need to be a plastic or acrylic heater, inline heater, or have a heater guard over it, otherwise it may melt the acrylic. For smaller tanks small mini heaters are available that would work just fine. Check out www.bigalsonline.com they will have what you need.
you can put in sea snails and more brightly fish that you cant get with a heater in your tank
Most fish are around 78 degrees F.
The only thing that you can put in a tank that small is a betta fish or african dwarf frog. Tropical fish do better in a tank that is ten gallons or more. If the tank has a filter and heater you could put one guppy into it but that would be all and I doubt it has a filter and a heater.
Before using a heater, how about you check with either the manufacturers or the place you got it from if it is safe to do so.
guppys are tropical fish. they require a heater, and 1 gallon is to small for a heater
Freshwater setup: MUST HAVE: Tank, filter, filter pads/media, heater, light, fish, water, electricity, fish food, place to put tank NICE TO HAVE: Substrate, decorations, tank lid
Put the heater on a timer, so it only works half time or so.
a fish
No
None. Bowls are for soup, not fish. Put them in a proper 10gal tank with a filter & heater, plants, rocks & gravel. Add some snails & shrimp for colour.
Gold is an inert metal (not dangerous to fish). You can put it into a fish tank if you choose too.
yes but it would need a heater as they are both tropical fish and you would need to change the water alot.