Some thing I am puzzled with, not only observing your tank, but also other pictured ones.
What I see is a glass container, with a missing top, I presume to be covered with mesh screen or other tops, but what I do not see are the customary (at least customary in the tanks I have seen in Italy) vents, traditionally one high up, and the opposite, down at substrate level.
These vents, I have been told, ensure ventilation and the necessary change of air/oxigen.....

Are they there and the pictures do not show them?