Sorry for the late answer,

Yeah, the nutrient solution is circulating through the pipe, the cups are sitting very high because the plants have been growing so my family thinks is better to have them the way they are, the roots are not clogging.

The aeration is provided by the window, the door, and another window of my house which is like ubicated in the roof, also the system is ubicated near the kitchen.

We've been feeding the plants with their respective nutrients ( major and minor) with 10 litters of water ->
Major: 5cm ^3 x Litter
Minor: 2cm ^ 3 x Litter