On the Sewellia tank, I put two layers of that in the Aquaclear 150, then a filter media bag crammed with carbon and then a regular Aquaclear sponge on top. In the old Penguin filter on the tank there is no proper media insert, just the black plactic perforated backing. Behind it in a media bag was some old worn out and sludgey Almond leaves. I cleaned out the bag and put in fresh almond leaves.
Then I did a 50% water-change. About 3 hours later, I'm talking to Dr. Momfish on the phone and watching complete Sewellia mayhem going on. There's lots of chasing going on.
So while I'm talking to her, I creep over to the tank. The male zooms around behind the big tall intake sponge to where a female is sitting on the glass. He flutters around her and tries to kind of push her, then half gets on top of her. At this point, she breaks suction on the glass and the two swim upwards a couple of inches kind of wrapped against one another. He forces her against the sponge and then she kind of flicked away, but as she did I saw a shower of fine eggs. They were immediately sucked into the filter sponge though

I only saw this happen once. Casanova was chasing and displaying to all the females in the same way. SO....there's definitely something going on.
Who was it that saw a similar thing with their fish....I forget?
I'm wondering that if this is how they spawn...effectively egg scatterers, then it's possible that Emma's fish had eggs sucked into the filter and the young hatched in there rather than getting sucked in when smaller. I know tomorrow the Penguin is definitely getting a sponge put over its intake

Martin.