Thank you everybody!
And yea, those three tanks are only 3 liters. At the time those three boys were in 1/2 gallon fish bowls like Purple Haze is now and when I saw those tanks online I bought them because it was all the money I had on me and it bought all three and 3 plants. They are better than the bowls and they have room to swim lol.
I'm currently looking into getting a 5 gallon long, a 10 gallon and a 20 gallon long from a guy a few cities away from me for like $10 each. I'm still trying to find out from him some information before I get them though. lol.