While the model is well suited to explore the general patterns of phytoplankton functional groups some of it main assumptions does not apply to the metazoans nor to individuals bigger than 200µm. One of them is the use of the quota approach. The main assumption behind that approach is the ability of phytoplankton to assimilation different nutrients separately. But this cannot apply to any heterotroph that will get its nutrients in bundles. In order to stay the closest possible to the original configuration, we decided to still use this approach for our metazoans but used internal processed such as the respiration on the nitrogen excretion to vary the internal C:N ratio. Even if this approach works, it is conceptually unrealistic.