THERE ARE TO MANY EXPERTS ON HERE MOST DON'T HAVE A CLUE WHAT THEY ARE TALKING ABOUT.RATS ARE RATS THEY BREED THE SAME DIFFERENT LINES ACT DIFFERENTLY SOME AGGRESSIVE SOME NOT.SOME OF THESE PEOPLE THAT ARE EXPERTS ON ASFs HAVE A FEW IN A TEN GALLON TANK & THEY ARE EXPERTS.DANG IM STILL LEARNING MYSELF ABOUT EVERYTHING.& IVE PRODUCED A FEW HUNDRED,& THE GUY I GOT MINE FROM HAS 1000's SO I TALK TO HIM ABOUT ADVICE.