I have 10 in my tank. I know your thread is super old. They have been a very sturdy fish I started with 12 and now have 8 the 8 have stood well. I bought them in Feb 26 some were rather small and not very good looking. They are in a 10 gallon planted with artificial plants and some live grass. Since I added the live grass they became a little more aggressive with each other maybe trying to find their spot.