Frog-O-Sphere problem?

I had the same exact issue with my frog-o-sphere, which is why I ultimately ended up upgrading my frogs to a 1 gallon MiniBow with a filter. The problem with the frog-o-sphere is that the small amount of stagnant, unfiltered water it contains results in a HUGE amount of waste. Waste = algae food. Of course, if you change the water more frequently to reduce the waste, you're just providing fresh oxygen and nutrients to the algae, and you will get a huge algae growth spurt after each water change. There's no winning. Even a snail won't help because it will just add more waste to the tank. On the other hand, a small tank with a filter, some real plants and weekly 25% water changes keeps algae at bay. My frogs share their tank with a few ramshorn snails, a moss ball, and an anubias plant and I have VERY little algae to speak of.