I have a well-established and healthy 30g tank with 7 full-grown cichlids in it. I added 2 yesterday. I had 1 elec yellow and she hid all day. I added another yesterday and now the old one is coming out and the new one is hiding. she doesn't move much at all and almost acts dead. just an effect from a new tank, or do you think it's a hierarchy thing? i've been told i need around 12 in this tank to make them sociable. they're all africans, and there's only one male.