If you can get Salty Shrimp, they make a GH+ and a GH/KH+ product meant to raise the levels for shrimp
Edit: those anubias shouldn’t be buried, their rhizome needs to be above the substrate
Hii this is unrelated to your question but if you don’t plan on doing it already, I recommend to plug that little hole on the back wall so no shrimp can get into the filter. I have a tank like this and unfortunately I had some chili rasbora casualties but luckily my shrimp survived. There’s a person on Etsy that 3D prints a little plastic piece just for this exact reason and it snaps in perfectly! Good luck with the tank! I just started my first shrimp tank too and I’m obsessed
rowletlee 
If you can get Salty Shrimp, they make a GH+ and a GH/KH+ product meant to raise the levels for shrimp
Edit: those anubias shouldn’t be buried, their rhizome needs to be above the substrate
I don’t have any helpful info, but I do have the same suction cup planter thing! They are so cool haha. Love the setup, it looks gorgeous
Yeah, definitely rocks would work, and what the other poster said too
Hii this is unrelated to your question but if you don’t plan on doing it already, I recommend to plug that little hole on the back wall so no shrimp can get into the filter. I have a tank like this and unfortunately I had some chili rasbora casualties but luckily my shrimp survived. There’s a person on Etsy that 3D prints a little plastic piece just for this exact reason and it snaps in perfectly! Good luck with the tank! I just started my first shrimp tank too and I’m obsessed