Vents are the easiest thumbnail to work with - an excellent intro frog to the Quinquivittatus complex.
They will use all the tank that you provide them with. They'll forage on the ground and they'll go to the upper corners looking for food.
They are not egg feeders.
They may like water a lot - but the only water in my Vent tank is in the 3 or 4 film cannisters (angled at 30 degrees from horizontal) which is where they'll either lay their eggs, or deposit their tads.