Hi! Can, I think. They provide oxygen during the day and act as hideout for fish. Makes fish feel secure. However, water change (siphoning of waste at the bottom) should still be carried out regularly. What kind of plants do you have in mind, or already have? Is there enough light since plants need light to grow. If there's no given light, The plants may die and add on the the buildup of ammonia in the water and make the water poisonous..
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