Quote:
Originally Posted by alyss19
They aren't fancy
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But they are still GF.
The GF are probably common or Comet Goldfish. They are also referred to as feeder fish because they grow lots of them (one reason why they are cheap) and some people feed them to their fish or turtles. (Lots of debate on that too

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Betta fish are a tropical fish and need warmer water. Where as GF whether fancy OR Common/Comet are a cool water, usually referred to as a cold water fish.
Betta should NOT be in cool water ~72F or lower. That is the main reason people will have heaters because in winter homes temperatures are too cool and in summer the A/C can make the house too cool.
Better temps for the Betta would be ~78-82F. A heater can make sure it stays at least that warm.
Water that warm is too warm for a GF to be at the best health.
GF like the top water temps to be 77F or LESS. Better temps would be around 72-74F. They can be in colder water temps too.
Fancies don't care for very cold water temps, but the Common GF, Comets and Koi can deal with very cold water even in the 40's.
There are some differences.
Betta, very minimum tank size would be 2.5-3G (for 1 fish). That is pretty darn small but could be a liveable place, though not the best choice. 5G is a nice size and some people prefer 7.5-10G.
They are a fish which will usually love to swim around the tank. Many newly acquired fish from the store do not swim much because they are weakened from sitting nearly motionless in a little cup. They can recover their strength by being in a nice space for swimming and have healthy food provided and good water conditions.
The largest a baby GF should be in a 10G tank
imo would be 4ish inches. 5 inches would be pushing it, they are high waste producing fish, need to eat numerous times per day (provding even more waste to the tank = ammonia), and they need LOTS of room for swimming.
If you are watching the water parameters and daily knowing they are in safe water levels, it will be trying at the least to keep them healthy in a small tank. HARD thing to keep up on. Especially if you have a social life, schoolwork and actual employment.