They are very aggressive and will bully whatever they outgrow. The male you see in the pic is constantly chasing everything in the tank. You have to see what the 2 females look like when they spawn with him. Here is an older pic of one of the females during a spawning cycle. Amazing they are still alive. Tried through a divider but there was no interest by the male. The older shot of them is from a year ago. I've been asked if they are slow growing. I haven't found this to be true. My male went from 5" to 12" in around a year.