Don't know if you can see from this pic https://i.imgur.com/Vu2cCWW.jpg but i've got a little stick on thermometer. The metal one is just a back up, don't use it when the fish it in the tank mostly cause it looks unflattering, but I did not know that they could get stuck behind it!Lookin' like a million bucks.
I would go with a digital thermometer. A digital one is easier to hide around the side of the tank and no risk of a betta hurting himself if tries to squeeze in between the metal thermometer and the glass.
I use one like this,
I find little scraps of driftwood to tie my anubias to at my LFS. I use a few loom bands to secure them.