I have 3 tanks with 2 Oscars each that had all been raised together until I tried pairing. My one tank they have layed eggs 3 times. But my other 2 tanks are in another room, the one tank both the heads are like scraped up but there is nothing sharp in the tank, even the rocks are smooth like marbles. They eat well, tank is clean and I only use purified water in my tanks. They don't seem to be in distress, any ideas as to what this could be?
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