O_O you got double protection on a betta fish.... xD
lol I'm grateful that my cat are very gentle with my parakeet & lepard gecko.
He never bother my fish & my pets but only go for squirrels & wild animals. I trained him to be gentle around my pets. I used to have a hermit crab that roam freely in my room, my cat would follow and sit by it. I had a runt parakeet which is a mate to my lonely parakeet, my cat loved that bird so much that he let Kiwi (a runt parakeet ) cleam him & sleep with. Sadly she got sick and died the next day at age of 4 years old. :( If I show & ineracts with my new pet by my cat, he will know that was not his prey or to be harmed. he learned the hard lesson from my pet rat. :O
Only one thing that need to be protected is my cat's treats & food. He will open the cabinets in order to get his food. lol. I had to put the food in the highest I could reach but my cat are smart enough to find a way to get it. He opened a shoe box full of treats a few times. He has those big paws & his size is probably a little double than an averge cat, he got it from his father.... He can open the doors himself, oh my! He's seven years old and still do it lol.
I only give my cat bottle of water & he never had a problem with it.