how to remove hiss from audio recordings

So i have been using logic pro x for a while and have worked on a ton of projects but i have noticed in all my audio recordings there is a "hiss" sound which messes up my whole work flow and i do not know how or if you even can edit out that sound, plus i doesnt give me the crystal clear sound that i'm trying to achieve. idk if this is background noise or something that i can fix internally in the logic settings. I use a sterling st51 condensor mic, scarlet 2i4 audio interface, 2 mackie mr5 mk3 studio moniters and a novation impulse 49 key midi controller. (idk if all that equipment is necessary to access the problem, but i really would appriciate the help.)