I cannot really say that I have ever kept a shrimp in a heavily stocked FW tank yet - hence, the potential bioload doesn't matter as much - but I believe that inverts are not usually included within any overstocking measurement....but, of course, within reason. However, I may be wrong about that because, like I said, I have never really been prompted to learn more about FW inverts and their impact; but, I do know that we can, in general and within reason, add copious amounts of inverts to a SW tank without becoming hugely concerned about additional waste production - so, I figured it would be a relatively safe assumption that the same holds true for FW. In fact, just like we might add a lot of inverts to a SW tank in order to compile a 'clean-up crew', a similar thing can be achieved in a FW tank. For example, shortly after starting out in this hobby, I decided it would be cool to see if I could breed Livebearers and to my eventual chagrin, wound up with a boatload of fry...which I would have to overfeed my tank with crushed flake food so that all of the fry could eat (I know, I know...keep in mind that I was very much a 'newbie' at the time). Of course, this meant some flake food would go uneaten; so I added a dozen ghost shrimp to make up for that - which they are very good at (it seems as though they never rest or take a break from constantly eating. I was also advised to add one or more Amano Shrimp to my planted aquarium when I was dabbling in that aspect of the hobby because they are great help with algae and detritus - so perhaps this is something you may be interested in for your planted tank as well.