It helped when I added a few. The new ones were a little bolder so they acted as a dither for some of the older ones.It's funny mine are almost the opposite, I have 12, rarely see all of them together but there's usually at least 8 of them out and about at any time. My larger corys tend to hide when I come up to the tank but these little guys don't mind and sometimes come up to the glass. I was in two minds about getting them as I was thinking of something a bit more colourful and visually interesting originally but am glad I went with them.