mom2reds

i am very new to this, so i dont completely understand. i have only had the tank about 3 weeks. the first week it ran with nothing in it. slowli i introduced some zebras. i have not tested the water yet but after reading a few posts i see thats a must, but i am curiouse as to why my other fish are thriving and doing great but only the pea-cocks are dieing. They start out fone then, they 1 at a time stayed at the top dull in color until they died. it seems like stress to me but im not sure ow to fix it