Hello; It is very common for new fish keeper to over feed at first. The fish may actually eat most, if not all, of the food. The extra food will either generate more fish feces or accumulate in the tank if not eaten. It took a long time for me to find a good balance with feeding.
If you do feed too much the extra stuff will have to be dealt with.
I like to have snails and live plants in tanks. The snails will eat any extra food and the portion of fish feces that may have some food value left.
The plants will take up some of the end results of the waste cycle as they grow. Even so the excess material will need to be removed somehow.
As suggested, this is usually done during water changes with some sort of siphon. It is my understanding that the python type can use running tap water to create a siphon and will send extra water down the drain when used this way. I use lengths of clear plastic tubing or a manual gravel vaccum which operates on gravity.