I'm in the exact same boat. I have breeding tanks overrun with duckweed and moss but my own goal in my home is shrimp tanks that are aesthetically beautiful. Ferts and CO2 can present challenges that do not exist in low tech tanks, but I firmly believe it can be done and am a few weeks into attempting it. Journal here: https://www.plantedtank.net/forums/1...akeover-4.html
I have photos of these from when they were low tech just crawling with shrimp. And they were pretty enough tanks. Low tech tanks can be quite beautiful, obviously. But my feeling is that with CO2, moderate lighting and ferts, they can look amazing and still be good shrimp habitats. I don't anticipate being able to grow blood red Rotala in these tanks, but I do think they can be beautiful aquascapes with healthy plants that have thriving shrimp colonies. I'm just having to see what plants will do best in them for these first few months.
I am not a believer in dirty shrimp tanks being ideal. I do use leaf litter and other decaying plant matter, but I've had far better luck since being religious about water changes and keeping things squeaky clean (by shrimp tank standards, anyway). I had my waves of tank populations exploding when I was more lax on them, but it was usually temporary and almost always Neos. Tanks weirdly do get better at being shrimp tanks the longer they have been set up, but I don't think that correlates with dirtier environments. Though having said that, I have cherries living in a dirty 40 degree outdoor pond right now.
These are strange creatures, these little crustaceans we fuss over. They can do so well for periods, then dwindle in numbers. They hate changes in their environments and will die or at least stop breeding sometimes after exposed to parameter changes -even to much better parameters. If a change is sudden, it's probably a bad idea. I have 4 tanks of different Neo colors and some are blowing up and others are not. None are dying, but some colors are out producing others by miles. All are same species. All are in the same tank size, same water, same substrate, filtration, food, etc. And one tank hardly sees any berry while the one beside it has 100 babies on the glass right now.