Yeah... That's a super bad idea for a way to pull them out for measurements. Check this method out, it works super well. Take a T-shirt, tie the top closed, then open it up and SLOWLY corner your cichlid while keeping the other end wide open. They'll run to the sanctuary of the opening as if it's a cave to hide in and close other end and gently remove while supporting the fish with your second hand. Also lay them on the cloth shirt to measure. Works wonderfully.
To OP, I'd just get urself an extra long python bell part. Mine's 24" and I rarely have to stick my hand in my water. That and a magnet cleaner and ur solid.