One fish, two fish make blue fish Jul 06, 2009 By dvm360.com staff New research shows that fish kept by themselves or in pairs in home aquariums are more aggressive and behave less naturally than those kept in larger groups. Click here to read more. Hot topics on dvm3605 ways to wow pet owners (and pets) 10 steps to take when a practice owner dies dvm360 sits down with Dr. Pol Ack! How do you spell that again? "Best. Veterinary Practice. EVER."