It’s not the right topic, but nevertherless I prefer to confirm your observation Helene.
On the 31st of August, I have introduced a first couple of P. tweediei in a tank. Untill now, I’ve never seen the female swimming around in the same way the male does. She’s constantly hiding herself behind a small air filter. She even doesn’t appear when it’s feeding time. Female Paros usually do 🙂 Though, the behaviour of the male helps me to understand she still there and well alive. He doesn’t hide and isn’t shy at all …
Two days ago, I obtained a 2nd couple of tweediei. Because of practical reasons, I decided to put them temporary together with a young couple of Linkei. It was an interesting experience to see how the two linkei reacted upon the arrival of two tweediei. Moreover, these new tweediei don’t hide at all. Both male and female just swim around together with the P. linkei.
I didn’t plan to put both couples tweediei together; your description makes me rather think about introducing a 2nd female into the tank where the female is hiding. Perhaps this might help her to leave her hiding place.