Shae: the large opening is the main valve, while there should be a small opening/tube, where you attach the hose. On one hose there is also an adjustable valve and I believe I included a T valve. I found it worked best to have the large opening under water just below the surface to break the surface. The CTs are actually used to a full flow bubbler now xD they love it.
The light knob is in the back and should either be a press (firm) or a twist. Unless its the one in the side. So many tanks and different ways to turn on the light lol.
Glad to know everyone is doing well.
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.