I recently added 2 Silver Dollars and 2 Tiger Barbs to my 40 gal setup. All the fish are eating and healthy. My problem being, if it is one, is that the barbs are constantly picking on the Silver Dollars. Nipping at fins and chasing them around in the tank. I know that it is in the nature of the Tiger Barb to pick fights but I would like to keep the Dollars happy and healthy. Should I take the Barbs back to the LFS or should I add another Dollar? What should I do?