To add sand to an aquarium, you should always use the opening of the bag under water. Thus, the sand will fall to the bottom to help, rather than locked and floating on the surface! Moreover, it is necessary to turn the filter OFF! Sand can destroy the pump in the filter! Wait for the tank seems clear, then turn on again. Do not worry, your fish will be fine without protection for a few hours! Have the heating system connected, but remove the filter.
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