07-12-2012, 08:07 AM
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Feed less. All food that you put in the tank should be gone in a couple minutes (2-3 minutes). If any food is left over after that time, you've put too much in. You can also reduce feedings to once a day, they'll do perfectly fine. Most people over feed their fish because they can put 'puppy dog eyes' to shame with how much they beg
But really, there is no reason to have it '100% clean' all the time, the gravel is packed full of bacteria that happily eat all the waste. The reason for the vacumming is to prevent a Nitrate factory from forming, but you don't have to be so complete with moving decorations out of the way to get every nook and cranny.
There isn't anything magical you can put in to take care of it. Snails will eat waste, but they still produce waste themself. Their waste is less complex though (they eat stuff, use some of it, poop out what they don't) and thus will be broken down by bacteria faster.
Live plants will eliminate your problem. If you fully plant your tank, you will never again have to vaccum the gravel, the waste is just broken down into plant food. If you only put a couple plants in, you'd still have to vaccum in the areas without any plants. Just avoid disturbing the roots of the plants.