These cultures can be maintained until the desired blade size is reached. As they grow, it is beneficial to
transfer them into larger flasks (i.e. 4 L Erlenmeyer flasks) or aquaria to promote growth (Figure 6.12). While it
is possible to use an aquarium at this stage, it is discouraged, because it is impossible to maintain sterile conditions
in aquaria. Furthermore, even with the best aeration there are often dead zones in aquaria that allow for
the settling out of seaweed onto the bottom. Constant motion of blades ensures optimum uptake of nutrients
and more even exposure to high light levels to enable faster growth.