I like to add in AmQuel as I fill up my tank, so it gets sort of mixed in from the water flow from the hose. If you are really concerned, then buy a rubbermaid container(s) about the size of how much water you change. (example--if you have a 55 gallon tank, and change about 25 % of the water, get about a 15 gallon container, or three 5 gallon buckets) Suck the water out, then fill up the container(s)/buckets and add dechlorinator. Then, if using buckets, pick them up, and dump it in. (if you have plants, it might disturb them, and the substrate too much). Or, if using a bigger container, buy a water pump to pump the water to your tank.
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