One is med and the other is large. Which I may break in half.
Looking at your pics, and looking at pics of silver tetra, I think there's a high possibility of them being silver tetra.
It's not the best, but it's the best option in light of the size of the hunk of wood. I was told pretty much the same thing with the piece of mopani
Nice, but the tanks looks too organized. Your plants look like little soldiers. All standing in a straight line. Maybe put the first sword on the left
A tetra for sure. Just do not know what kind.