Squares much easier up against glass, but I can understand the appeal of round ones for getting between decoration & such. What shrimp are you trying to catch with them?
@xXInkedPhoenixX has a whole journal on Oto breeding, so I expect it should be possible, and I managed to breed hillstream loaches with splash tetras (did quite well 😊!)
Idea for @Cory! I recently borrowed an old conductivity meter form my school science room (benefits of high-school!!) which was quite useful; is that the same thing...?
I'd say that splash tetras are the most fun things I've kept, and I was expecting them to be kinda boring, like the glass sharks I used to keep. Looked cool, didn't do much else!