I have two powderblue tincs. that i keep together in a 30 gallon breeder tank. They are the same age and have been kept together for over a year now. There is one larger than the other that i have never witnessed call. Today i moved the two into a ten gallon that has been empty for several months and is fully planted while doing work on the 30. As soon as i placed the frogs into the tank i sprayed everything well. Ten minutes after putting the frogs in the tank i noticed the small frog on top of the larger frog followed by croaking and chasing around the tank. Is this an agressive behavior being the tank is much smaller or is it courting? Is there a size difference between male and female?