Animating anchored parts?

I can’t really animate a part if I want it to go up or down for example, I have to use tween service, and I am worried that 60 tweens playing constantly is gonna cause issues, let alone 300ish throughout the game (with streaming enabled)

this sounds like a very specific example but it is pretty close to what I am attempting to do, in certain games they have stuff like orbs that just float up and down, I am assuming that is an animation, I made an animation as I am creating something similar, and while the script does play the animation, nothing happens to the part itself because it isn’t anchored and the animation isn’t gonna run if it is anchored

if you need more details feel free to ask I am open to alternatives too, I’ve got very little knowledge on the animation side of things (I use moon animator 2 btw, I exported the animation as a rig with a root part.)