yellow clown goby with green clown goby?

[don trinko]

I have a 20g with a royal gramma, 2 clowns and a green clown goby.
If i added a yellow clown goby would the green clown cause problems? Thanks; Don

 

[btldreef]

It could. They can be aggressive towards other clown gobies. I had a green years ago that killed a group of 6 yellows. Of course, the green was full grown and had been in the tank by himself for quite some time and the yellows were about 1/3 his size.