Hello, I'm sort of new to fish keeping,I've taken care of some fish in the past though.The longest fish I had was a Tiger Oscar Cichlid and a Plecostomus. They both got to big for my 10 gallon tank,so I gave them away. Anyways, I got a 20 gallon long fish tank awhile ago, so I wanted to set it up. We (my family) had a turtle in the tank before,but we had some supplies from our ten gallon.So my dad had to buy a hood, a 20 gallon filter, some gravel and a decor with a bubble blower inside it. We had some fake plants and a cave decor piece from our ten gallon.We also had the air blower from the ten gallon too.So, we rinsed off everything and set the fish tank up. Right now we are just having it cycle for a couple of days.But here's the problem we only have one submerge able heater and the heater is in our other 5 gallon tank with the tiger barbs.My dad does not want to buy another one either,so if we take the heater from the 5 gallon and put it in our 20 gallon long tank, and then once the tank is warmed up can we put the tiger barbs in? Or do you guys think they will die? We had the tank cycle through out the night and I put in some chlorine remover and water conditioner.I just want to know.We can't buy another heater because we only need one.The 5 gallon we will put goldfish in next time. Also once we get the 20 gallon all set up what kinds of fish can I put in it? I really like the African Dwarf frog, Orange Von Rio flame tetra, Red belly X-ray tetra, Velvet wag swordtail and Silver Lyretail Molly. I just don't know if they will get along with each other. Also, I'm sorry for writing this much but, I wanted to get all of the details in. Here's the 20 gallon so far.