Here's an update on my Vent trio tank after 1 year. Getting overgrown (except for the orchid on the back wall that has lost most of it's growth). Not surprising due to the lack of air movement. I think a small fan would be a good idea. No breeding behavior from the Vents. I am becoming concerned that they may all be females (see photo).
Bob
Vivarium - 1 year after setup:
Their inhabitants - 3 nearly -1.5 year old D. Ventrimaculatus 'Iquitos' 1.2 or 0.3?