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HI group, I have two Platys that every once in a while will dive at a plastic anchor I have in my tank for decorations. Can any one tell me why they do this? Could it have anything to do with the cleanliness of the tank? Because they seem to do it when it is close to time when I have a tank change. Or rather if I am late with that change. Also I have a Platy that is protecting a certain corner at the bottom of the tank. What could that be about? Thanks for any help in this, God bless.