I am sure uncle @Rob Fisher has all the stock he needs, but I am curious to know if the rest of the Dvarw owners have considered contacting one of the pharmaceutical glass companies in South Africa for possible glass tanks for the Dvarw? I had a look and they have LOTS of size options, but all in longer lengths. Is it not worth it to ask about a batch of Dvarw specific tubes and see what the price comes out to?