I got my tilapia Monday and everything is going just fine. I got 85 fish for my 300 gallon fish tank in my basement. The man I got them from said they might start reproducing in about a week or so when they get used to the tank. I have only had them 4 days and they seem to be pairing up and protecting little spaces in the bottom of the tank. The fish are different sizes and it seems to be the larger that are pairing up. Are they getting ready to spawn or is it wishful thinking. Will they just spawn on the bottom of the tank without anything on the bottom? Thanks Ricky.