I am trying to reduce the bio load in my 55 gallon. I have a 20 gallon with a lobster in it. Would this be big enough for 2 green chromis or would that be just plain mean?
You could have them in a 30 gl, depends how long you going to leave there......is it going to be forever or just for a little time....If they are not that big, IMO I believe you could...If you can later transfer to another tank.....
Most chromis will outgrow a 20 gallon. They do grow slowly though, so you have some time. They DO like a lot of swim space though. I feel like my 3 are cramped in my 70. I have been considering getting them out.