Why has my old dog suddenly turned on the new pup?

hello we just recently adopted a one year old husky we already had an eight year old mixed breed it took about two weeks for them to start playing my old dog was not happy about it but he finally came around but now this past week he keeps attacking the new dog he’s not just correcting him either he’s literally attacking him I’ve kept their food separate bones toys anything that can trigger him I let them sleep separate I try to make sure they get daily exercise and even amounts of love will he come around eventually I don’t know what to do thank you for your help