You can get Clove oil at any Grocery store I think, and I think it is 1 Teaspoon per every gallon?
I don't know, you might have to look it up.
Then once he is asleep, you put 100% hard alcohol in the water to kill him. It will be totally painless.
Tell him I said bye, and when he gets over the Rainbow brigde to say Hi to Minnie and Verde' and all my Betta fish and Goldfish.
*2 Bettas (for now RIP Ryu) *2 Goldfish *9 Guppies *1 Gourami *2 Chinchillas *2 Budgies *2 Dwarf Frogs *1 Dog *1 Cat *2 Hermit Crabs *2 3gs *1 10g *1 Pond *2 2gs