About 1.5 to 2 weeks ago I had an ornate tetra that lost his color on and off for a week then finally passed from I'm assuming the stress of repeated power outages, I now have a lemon tetra that went from yellow to silver yesterday but has his color back today, he is also getting bullied by the other tetras if he tries to school with them, all parameters are perfect, no ammonia, no nitrite, pH 7.4 tds 158, nitrate 25, phosphate 1.1 I'm thinking there's a bug going on in my tank, fish dont have symptoms except the one that gets bullied he really don't have an interest in eating, I was thinking about going heavy on the schooling of them To see if that may help as they always hide but I don't want to do that right now with losing one a few weeks ago maybe closer to a month, and ideas what's going on these fish aren't old