Cory video update

One of my Cory habrosus died after just few days from being introduced. Other inhabitants are doing great, showing good appetite.
I am feeding them with shrimp flakes and infusoria sticks. In this video one can see the Corys and Otos going crazy over the Hikari 'Protogen' infusoria sticks.
Even though this substrate is approx 11 month old, full with organic build-up, not even one Cory is showing barbel erosion. I would say that this soil is well oxygenated by the plant roots, which introduce lots of O2. Bacteria surrounding the roots need O2 to be able to transform organics into usable plant nutrients, and by doing that reducing anaerobic conditions. Anaerobic gases transform immediately into aerobic ones when in contact with O2 (I have read this in Diana Walstad's book). Anyway it seems to work.
Corydoras habrosus and Otocinclus;
Corydoras pygmaeus;