You should occasionally discard the bottom part of stem plants and replant the healthy growing tops. This way it won't be bushy. And the healthy tops have better chance of growing.
There's no need to vacuum or disturb the substrate. The accumulated sediments there is good for the plants and the substrate. When changing water, try to use a container of something to prevent the water from the hose/pail from gushing straight down to the substrate and stirring up the sediments.
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