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how do change your water if an anemone is located right at the water line and when you vacuum, the water level goes down, i dont think the anemone can move fast enought to get out of the way.
The only caution I would look for is where the anemone is sitting. If perched on a sharp base, it can cause damage as they cannot support their weight and will tear. If on a smooth/flat rock or glass, your good to go.