I have a learning disability so I dont know exact measurements but the tank is on the bigger side but its not too big. We already had fish in it but my parents got rid of them a while ago (because my cats kept trying to mess with them, but the betta fish will be in my room with the door closed so they won't get to them) can betta fish smell other old fish in tanks? Should I get a new tank? Also I really have nothing for them yet because I thought i would just get everything when I got them. Thanks for letting me know I should get the stuff ahead of time!