I am looking for some bright colorful fish that will school together. A while back my daughter picked out neon tetras, nine of them and within three days all but two had died. Now I only have two & worry that they are stressed since there should be more. I was later informed there is a high death rate for these fish BC of over breeding. Any advice about what to do or what to replace them with? I thought of taking the two who survived back to the store and starting over with a new school of hardier fish.... But what kind?