To make observing much easier, I don't normally use cups, floating plants, or whatever. Instead I cover the top of the tank/tub where I want him to nest with something dark while the rest is either left opened or covered with a rather see through plastic.
Sometimes it's hard to tell if they've spawned or not, specially if we can't see them. But usually if the females keeps returning to the nest, they haven't spawned. But if the female always keeps away or if the male always attacks her every time she comes close, they've probably spawned.
Last edited by indjo; 07-28-2011 at 10:00 PM.