I would aerate. The very depth of the storage vessel means the greater concentration of oxygen is near the surface (the atmospheric interface) with diminishing levels further down the water column. Where is the outlet in the storage? In the anoxic zone.
Great photos but are you absolutely sure its pearcii and not a hybrid. The several different clones I grow have much finer petals held at 45 degrees to the flower.
Thanks David. I had read a reference to aquatic baskets some time ago so i got a bunch from WA and gave some a try. Initial trials were too dry so I reduced media size by one grade and still seemed the same but I'll give the sphag lining a try. Thanks for the advice.
john