Take a look at the Tron-T and Tron-S from joytech the T has a glass viewing window on top and the S has a large window on the side. I have the same issue with the ego one tanks, can't see chit in them. I just don't like any of the caged tanks for that reason. I'm going to order the Tron-T hopefully I can see enough to not keep overfilling the tank.