All of a sudden my neon tetras (All 9 of them) are scared of me! They used to follow my hands and come up for food as soon as I opened it, but now they flinch and hide, 4 of them randomly went all weird and died, symptoms of a illness or just scared due to the fact I'm about 1000 times there size haha? Also they do eat, just after I have moved away, I haven't been banging the glass or anything stupid, although I have a little brother and a cat so maybe one of them gave them a scare.