Yeah, the adjustment is mainly for those who prefer to retain more Co2 in their water column during the active photoperiod during the day (less surface agitation, while the pearling plants are what achieve maximum oxygen saturation in the water instead)... then only at night they aerate further by lifting up the lily pipe. It's an alternative to running an air stone at night.
I remember reading about ADA staff diligently lifting all the lily pipes on their gallery tanks every night... the benefits of having a team of dedicated professional staff maintain tanks.
Those are good quality glassware... still made of glass though, so can still break if dropped or mishandled. That being said, the glass used in those brands are thicker and more consistent, so they tend to be abit more durable.
Bookmarks