Now this is just my opinion and how I keep frogs and why. If I was in your situation with your frogs than I would stick with the two Whites and they could grow comfortably in the 33 gal. Then as soon as the baby was big enough to move into the 33 gallon I would start designing the 10 gallon. I don't know maybe go vertical and get a Red Eye Leaf Frog or perhaps stay horizontal and get a couple of bumble bee darts. I like variety but also do try to limit the number of mouthes to feed. That's why most of my frogs I keep in pairs. Again this is just how I do it...I like to experience different types of frogs.