Kyon has a hole in his tail and some chunks taken out the end! I think he's biting again he's in a heavily planted tank with lots to look at and swim through. I play with him daily while feeding him. Is there a chance that adding the cories has upset him a bit and he's biting out of stress? There's no stress stripe and he's not attacking them. I've checked the water. All good, no ammonia or nitrites and just below .5 nitrates. All my decor is definitely smooth enough for him and I only use live plants. It's starting to upset me because I just want him happy and healthy. Any ideas to stopping him from doing this would be great.