what feeder fish?

Thanks i see you finally understand what i asked and sorry no worms because the point is to make the oscars fight for there food.

Encouraging aggressive behavior in Oscars or any other fish is NOT a good idea. Once you start they may become incompatible with each other or with other tank mates - then what will you do with them?
 
Ok i give up i will but a new baby tank. Please tell me how many liters or gallons it has to be and all a have to do is through the pregant female in a breeding trap for a few days and then whan she gives birth i take her out and all i need is to put a few plants in the baby tank so they can eat it.
 
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