How to simulate the macroalgae

I found that the EE8.3 have the function of simulating the macroalgae after I configured the model in the kinetic tab in the water quality model, i found the initial condition of macroalgae canbe set, the macroalgae boundary condition cannot be set through the same methods similar to the water quality 21 sate varibilities, so how to set the macroalgae boundary condition? thank you.

When using macroalgae there is no boundary condition. This is because the macroalgae is unlike other WQ constituents: it is an attached organism and does transport or move in or out of the system.