So I got my first nerite snail a few weeks ago but constantly found him upside down...he definitely could not flip himself right side up at all and was usually all pulled in his shell so I brought him back and exchanged him for another snail. I've had the new snail for over a week but I'm getting a little concerned. Every day I find him all the way up the side of the tank outside of the water...I got the snails originally because I have a severe algae problem but now it seems like the snail will only eat the algae if I put him on the decor or plant and he slowly eats it as he finds his way back up the side of the tank. I can post pictures but I don't know if that really helps (he had shell damage when I got him but he was the best looking one they had), the tank is cycled and has been for about 6 months with 1 betta and 2 ADF I change 3 gallons out every week and the readings are usually 0/0/10 every week so I figured there was a little room in the cycle for a snail.