I just got a new, small sucker fish that is supposed to be friendly with my betta, I wasn't sure how to introduce them and I put my new fish in with my betta, but I was told a couple minutes later that I wasn't supposed to do that and was supposed to gradually add the aquarium water to my new fishes bag because its supposed to keep the pet store water. will my fish be alright? also, when my fish was in the tank with my betta, my betta was nipping it, how do I prevent my betta from killing my sucker fish?