Yes
yes because there used to the tank and they become nocturnal
In general, rodents are nocturnal pets. Such pets include rats, mice, and hamsters. Cats can also be nocturnal and it can seem as if puppies are nocturnal (though dogs are not inherently nocturnal animals).
It depends on the species. Some are nocturnal, some are diurnal.
No, fighting fish (Bettas) are only interested in fighting with other fighting fish.
Of course they can. How else would we have fighting fish.
"Fish" is a general term covering lots and lots of different species. Some of those species are nocturnal, others are diurnal.
'Japanese fighting fish' 'Chinese fighting fish' 'Siamese fighting fish' and 'Betta' are all names given to the 'Betta splendens'.
Blue Tang fish are not nocturnal, but are active during the daytime. These fish live in shallow waters of the Caribbean amongst the reefs.
Fighting Fish do eat each other so, yes
yes allchinese fighting fish fight
yes if not how its fertilised
they do fight.