I picked up four Amano's for one of my cubes this past Friday. Sadly I've lost one (due to it bailing from the tank) and the others seem fine. I noticed while watching the tank today, two of the three left become spastic when they swim. They will coast end to end of the tank and once they hit the glass they snap their tails and almost jump out of the tank. If they do a 180 in their travels they crash into plants or substrates and don't go back to normal till they grasp onto something to climb. Is this signs of anything?