I just recently got a Eshopps overflow box 1000 dual u tube, I've noticed that one of the u tubes starts sucking in bubbles and the siphon stops. The water level is good. No air stone in tank. It looks like to me that the water level in the box is low but I've had this for about 6 weeks and it didn't do this in the beginning. What could cause this? Could it be something I did?
Thanks
Thanks
