The female angel will signal to her mate that she's ready to lay eggs by cleaning a vertical surface, like an amazon plant leaf (their preferred spot), a piece of slate or even the filter. It must be defensible so they'll spend quite a bit of time picking the right spot.
Then the female will begin moving up the vertical surface, laying dozens of eggs with each pass. When she's done, she'll typically have more than 300 eggs laid.
In between her passes, the male will follow and inseminate them.
Here's what the filter intake looks like after the eggs have been laid.
Tomorrow, I'll show you what happens when the eggs hatch!
