Thats the same experience here 🙂 … they are very interested in what happens in the other tank, sometimes not even noticing what comes down in their ‘own’ feeding hole, but rather wanting what they can see in the other tank.
Sometimes I have males show off to each other as well.
I have pieces of paper in between most tanks as well.
Really good photoes of the fry – I will put some in the species section under quindecim. You know, these fry are not just born yesterday 🙂 .. they could be a couple of months old I reckon.
And by the way, I think it is very likely that if you moved some plants the quindecim female could very well have been stuck in there and it is very lucky that she fell into the other tank. This is one very big risk with paro-tanks, – when you move something it is so hard to be real sure that theres not a paro hidden somewhere in what you think is just some dead leave or some plant stuff. They have a developed sense of ‘hiding’ this way, – when something moves in the tank they slowly moves with it – like underneath a piece of wood – they will drift up together with the piece you are moving underneath it in order not to be seen. Or they will stay inside a piece of wood even when lifted above water. I have lost more than one paro this way so I am always very very careful.