Do you add any ferts or anything? Shrimp don't have much bioload so I'm wondering if I'd be okay just leaving some very low tech plants in a tank with just shrimp.
Most of my planted vases get a *very* weak (about 1/10th the normal dosing rate) solution of Pfertz micro/macro solution every week or two. I didn't fertilize at all on this one for the first six months and the plants did okay. With this very low dosing I still get the very slow growth I want but better color and stronger root system.