You could do that as long as what you are scooping the water out with is only used for that purpose(make sure it's never contained any chemicals). Another way to go about it would be to use a piece of plastic aquarium tubing (the type that you attatch to a bubble-wand) to siphon out some water and detrius from the bottom, and then add water back from a gallon jug or something. Just make sure to add declorinator to the water you add!
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