In the first version, we experimented with a conical flask and used that for growing the algae. We had some issues sealing the top but we used cotton bung/ styrofoam to make the lamp secure with the algae inside. We needed the tube to be stable but that was one of the pitfalls of this flask. Another disadvantage of using a cotton wool bung was that it needed to be sterilized and that is sometimes not accessible.

We therefore moved on and bought a kitchen flask with a cork top, attached below. This cork is perfect for securing the tube that aerates the algae culture. I drilled a hole in the cork which is the size of the tube so that there is no spillage. This is definitely a great update for the lamp and the algae thrives in it because it gets perfect aeration without being fully exposed to the environment as with the cotton wool bung. Aesthetically this flask looks beautiful and fits perfectly in a modern apartment. Since this is a functional lamp that lives in your house, choosing this enclosure for the algae made it almost production-ready!!!