I've had a 10 gallon tank of glofish (8) for seven months. I moved the tank from my classroom to my home for quarantine, and one by one they have been developing symptoms associated with swimbladder. They swim in a disoriented way, and have trouble staying upright for a few days, then they lay at the bottom and look miserable permenantly. I've had the water tested, and it's within healthy limits I've lost 4 fish in the last 4 weeks. Swimbladder isn't contagious, so what else could it be? Trying to keep the remaining ones healthy! Thank you for any insight!