Depending on your tank size, they can cost anywhere from 10-50$Really cross now, even told the guy at the shop that it's a cold water tank with no heater n he said to get the cherry barbs. They even went as far to say any fish labelled with a blue sticker are fine for cold water. Thats 6 fish thats are going to die needlessly and my little girl who is going to be really upset
I have very little money so if I was going to buy and run a heater it would have to be really cheap
It'll be worth the money. Make sure to follow the directions on the heater by the letter, these days they're rather fragile.