I am not usually not replying to thank the contributors but sorry I was busy.
Thank you all for your replies. If the fungus gnats are not especially harmful to the plants then I don't have a problem (unless they become a large cloud flying around LOL). In fact I love insects and I love to have insects close to where I live (I enjoy to have any possible life around me).
edit: I haves seen a Pinguicula plant at a Garden center and I was amazed, maybe I will go and have one.
Here are two photos that I've shot: