Why don't you invest in some of them suction cups that you clip the tube in and then stick it to the side of the tank! Thats what I did!
I can't see blue tak or white tak being much help in the tank! Or you could just lodge it behind something or if you have some small rocks use them to keep it in place
I certainly wouldn't use blue tak in my tanks. I recommend buying some suction cups from your LFS to hold the airline in place, that way the stone should be unable to move.