I have a 90 gallon with 20 roselines (will be rehoming to a 125 around Christmas). The 90 has the 20 roselines 10 diamond tetras and 10 brilliant rasboras. The 125 will have roselines and others i haven't made my mind up yet. anyway the question is a friend of mine has 8 up for sale because they have become fin nippers and killed an angel fish. I was wondering if i can get them i'm worried that my sharks will pick up on this or that hers will kill mine (all sharks are around 2 to 2.5 inches).