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O.K. guys - I just went upstairs and looked again. The pump in the cabinet (will take a pic of that tomorrow) on a shelf is ONLY an output pump connected to the two small tubes as the type you would use for airstones in an aquarium.
The big tube (as in pic #2) is connected to another pump (just decided that) down in that hole which is covered with water and pumps out the waterfall hole.
Now... where do the little outflow tubes go and for what purpose?
I can only assume that since this is a drip wall set up (and since you've ascertained that the larger tubing feeds the waterfall), there must be two outlets somewhere in the wall- I don't imagine that they'd be very obvious from the front as they're designed to be hidden, but is there an area that you can recall saw more water than others? Also, are you able to access the space behind the back wall? Any space for the tubing would likely be most evident there.
pictures through the back glass would probably help in this situation as well as pics of your pump setups and anything where tubes may connect.
you are saying that the pump looks like an air pump. although it's possible it's not probable so i would assume you're talking about a dosing pump or one specifically designed for a drip wall although i have not heard of any made specifically for that to date.
Thanks beckdg, I so appreciate your trying to help. I will get more pictures as soon as I can. I have to charge my camera and run an errand, so I can get back to this. Of course my viv is up against a wall and I can't budge it so I don't know how good my pictures will be, but I'll try. Thanks again.