I think I've found the tank I want to get, but I wondering about a few more things. I've heard from diffrent places online and in books about the size of tank that needs a heater, and can't figure out if this would need one. It says it has a filter built in, so I not sure if I'd need to get one, and I'm also not sure about the BIO-Wheel filter and what it does. And if anyone has a link about cycling a tank but made really simple, that would be great. Thank you!