3 or 4 green chromis in a 40g?

[sumpfinfishe]

Adding fish for natural schooling is great if you have a very large tank, say a 240gl or higher. As mentioned, in most system's our tanks are too small for this purpose so you would be better off getting one chromis instead.

I like these fish and think they look great in reef tanks, unlike most other damsels. I had one in my reef for over four years and it never bothered a soul