Poison not effecting Players

Ok, I was gonna try the new fish! I wanted to see their effects and things, I did /effect BrianHernando 17 100000 255 As 255 is the potion max, and it had the green hunger bar, but it was as, it was not on me? My hunger was lowering as I didn't have hunger, I tried a potion strength of 10, not working, I lowered the time to 50, nothing worked. Thanks.