[karimwassef]

Ok. I'll simplify.

I look simply at organisms in my tank either as sequesters or converters. Most are both, but usually heavier one than the other.

Algae are sequesters in my view. They grab N and P inorganics and without needing additional C, sequester them in biomass.

Fish are converters in my view. They consume organic foods, sequester a little, but mostly convert it to other finer organics and inorganics..

Looking at sponges as converters - what's the in and what's the out?