RES dont understand, they just keep scratching hope they can swim more, but they dont know anything about this thing. this thing is usually called glass. most aquarium made from glasses.
My turtles like to scratching the glasses =.= every morning they all get crazy. -_-
so any idea?
can glasses make turtles hurting them self? and cause an infection?
or glasses can make turtles happy.. because they can see their owner. -.-
pros/con. go!

