Thank you very much, Helene.
Your tipps confirm what I had in mind myself. There is a small free room just behind the front pane, big enough to go down with a medium sized net, and I thought that maybe it might be possible to slowly try to catch them there. I will give it a go at first, and if I don’t succeed, I can still strip the tank as far as necessary.
In the Betta News-download here on the Paro-website, I read about a glass fishing bell which is very highly recommended.
I have read about this before, many people are very satisfied with it. I formerly already found a source of supply for such a fishing bell – not made of glass but of plastic. I often thought of buying it, and then again didn’t.
But first I will try it with a net – I have never experienced any uneasiness in the fish after catching them with a net up to now. And I made the experience that it is much easier to catch even small fish with a big, wide net than with a small one. But it is – as you said – a question of available room in the tank…..