cardinal tetra

First off, I've been creeping on this forum for probably over a year now and it's awesome! I've had tons of ideas and learned a lot about bettas and just aquariums in general but right now I'm completely stuck. Sorry if this is in the wrong section as I'm really asking multiple questions but the...

Ok, so I have a ten gal. tank, a very chill betta and a Marina Slim15 filter. My tank is on its way to being nicely planted with lots of hiding places. I have been finding a lot of mixed results about adding cardinal tetras to my tank. There are also two Amano shrimp in the tank already. I...