Hello Andrzej,
I decided to email the shop, rather than write. That way, I’ll be sure of no misunderstandings when I get their reply. I asked a lot of questions.
Stay tuned…
By the way, I know these fish are not usually recommended for people as their first Parosphromenus. I am very carefully setting up my aquarium and have read a great deal of info on keeping these fish. Would it be inadvisable for me to purchase them?
Jonette