You will have low light so you'll need to stick with Crypts, Jungle Val, and maybe Water Sprite to plant in the substrate and use Anubia's, Java Ferns, and Bolbitus tied onto driftwood or rocks.
Dump the water and don't use the salt. Salt can absorb into the wood and you don't want salt especially leaching in unknown amounts into the tank.
Thanks, Eastern washington is a great place to live. Nice to have all 4 seasons and rivers, lakes, ocean nearby. I am fairly confident my betta will move to a 10g tank. I have no idea what fish will fill the 37g as of yet.
It sure is!
Have you checked Dwarf Cichlids out? They are kinda like Bettas, but come from South America. In a 37 gallon tank, you could do a pair, a couple schools of fish, and then some bottom feeders or larger shrimp like Amano shrimp and a few Nerite snails, for your clean up crew. Loaches are another choice, but you would need sand.
I have sand and that is a very good suggestion. Thank yoiu