i bought a bala shark and i put him in my 25 gallon. that was about a year ago. he obviously out grew the 25. so i got a 60 gallon and now he is constantly trying to swim through the glass almost like he is trying to keep swimming. what is wrong him? it is a planted tank. ammonia is at 0ppm nitites 0ppm and nitrates at 10ppm. if any of this helps.
matt
matt