I had a breeding pair..they do grow pretty large...mine were about 5-6". The male was long and thin with beautiful orange/blue coloration and the female very fat. They were very aggressive eaters and ate anything which can fit in their mouths, small fish etc..they were active swimmers when small, but as they grew larger they just hung out under ledges or in caves until food was around, but when the main lights went out and moonlights came on the male swam out and did a courtship dance with the female following after him with violent splashing at the surface follow by a feeding frenzy from all the other fish eating the eggs.....I lost the female when she jumped through a hole for some plumbing and the male wasn't the same after.....he just didn't eat well and soon died a few months later.