It seems like you are dumping a bunch of biomass into the tank and you have had fish for only a week. Are you checking your ammonia, nitrites, and nitrates? Be careful, you have some nice fish...it would suck if you lost them......
I am sure you know that you can do WC's to keep the water in check but it is much easier to let some small fish cycle the tank for you....
I am sure you know that you can do WC's to keep the water in check but it is much easier to let some small fish cycle the tank for you....