Betta Fish and Red claw crabs
So I recently set up a 2.5 gallon tank with 1 betta and one red claw crab in it (the tank also has a rock, an air pump and a few live plants) I dont have a filter yet but im hopefully getting one soon.
I have been recently reading around on here and it says that these two aren't a good pair. I question this because mine seem to do fine together they have stared at eachother close up and dont seem to have any aggressive intentions. Is there any chance these 2 could do fine together?
Also the tank I have is fresh water, it may have a little salt because I got some of the water out of my grand fathers fish tank and im pretty sure he uses a little salt in there. Should I change the tank to "brackish" because I have heard that bettas can thrive in brackish water aswell.
Also I dont have any solid land objects for the crab (exept for him being able to climb to the top of the plants). Should I add some driftwood or something for land, I have heard they dont need it
Any help is appreciated!!!