If I can, I slowly siphon water in and out to make sure it all happens very gently. Fish hardly notice, tbh.
However, siphoning water in isn't always possible. If I need to bucket it in, I use a large jug and put my hand in the flow to temper it a bit.
Most important thing is to match temp, pH and hardness, and to condition the water.
However, siphoning water in isn't always possible. If I need to bucket it in, I use a large jug and put my hand in the flow to temper it a bit.
Most important thing is to match temp, pH and hardness, and to condition the water.