We have a mix of domed and flat ones, which we've used in our tetras. So far, we haven't had any problems with them. One thing we have noticed is that we've broken some lexan clovers with some rough handling from the robot (ie. dropping them from 10 feet up.) Also, we'll probably add some lock washers to the bolted connections, as they tend to loosen up over time. Don't sweat the details and get these built. The sooner you do, the sooner you'll figure out how difficult they are to handle.
Bengineer
Team 228