My six inch albino rainbow shark is swimming veryically and very lethargically. Although I know it's totally normal for this type of fish to have quite out there swimming behaviors this is a new behavior for mine who I've have for about a year and a half. She's staying in the top 7-9 inches of water vertically just swaying back and forth with the occasional twitching and tipping backwards slightly. I know a few things this could be but I'm really not sure at this point. Is she fine? My other fish seem to be acting perfectly normal other than the fact that they've tightened up there school to stay away from her, if you could offer any explanation or advice it would be greatly appreciated.