Whisper 10i Versus 2-10i

[JustLikeAPill]

Hi guys. What's the difference between the whisper internal power filter 10i and the 2-10i? I bought 2-10i but should I have bought the 10i? They were the same price and i feel like maybe my ignorance ripped me off lol. I want it for a 10 gallon Triops tank and If i can convince my parents to let me, maybe i'll add a Betta!