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In the last two pictures there is some kind of glass device attached to the right side of the aquarium. It looks like a small flask-like bulb with a neck that bends like an upside down U. The bulb has some kind of liquid in it, but the neck is full of air. I'm guessing---is it some kind of CO2 level indicator? Is there a dye in the bulb, such as brom thymol blue?
 

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I believe that is the ADA brand CO2 quick indicator, similiar to the other ones on the market like the eheim one. I believe they do use bromthymol blue, at least the liquid in my little bottle looks like it...
 
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