A little update:
The archer (Spitfire) has been doing well. He eats pretty well, and I feed him around 2-3 times a day, depending on how long I'm gone in the day. Should I try to feed him live bugs or are bloodworms just fine? I just cleaned his tank yesterday so he's extra happy with clean water and fewer plants. A really cool thing about the Anacharis is that roots are dropping down from the "stalk" (not sure what you call it, I'm brain dead right now) and it creates this almost mystical look. I'll take a picture soon and post it.
In the future, I intend to keep the Anacharis in the tiny tank (didn't work out in the main tank, I put a few in there and they were just annihilated, maybe by the flow? idk), however, I also intend to get some Marimo Moss balls or some fuzzy moss (mainly for the shrimp).
Are there any other shrimp decor recommendations? I've seen these mineral balls for shrimp before at stores, do I need them or not?