......I have two acres with rocks under the ground starting at about a foot under......I need to move some rocks.....
Are these the same rocks? A BX is a versatile machine, but if the rocks that are a foot down are the same rocks you want to move, then a BX may or may not be the right machine. If you are talking about moving surface rocks (not boulders), no problem. If you are talking about moving subterranean rocks under a foot of hard clay, then you need an L series tractor with a sub-soiler to rip through the surface. If you want to move rocks under a foot of sandy loam with no big roots in the way, a BX can rip deep enough to expose them. Soil type and roots make a huge difference.
If the rocks are surface rocks, a BX1860, BX1830, or even an old BX1500 would likely be capable of doing what you describe.
If you have little rocks, consider a rock bucket, landscape rake, ratchet rake, etc. If you have lots of small boulders, consider putting a grapple on the FEL, or at least some bucket hooks on the FEL bucket. Also be aware that a backhoe with thumb can lift some small boulders that are too heavy for the FEL to lift. You may also consider a "rock sled" aka "stone boat".
Depending on the soil type and how much dirt you want to move around, the FEL would suffice for a small amount. If a lot, then you probably need a box blade and at least one of several types of drag screen or similar device for finish work.
If you are unfamiliar with these terms and implements, just ask which ones you'd like to know more about. Members can explain them. You can also find endless threads about all of these things by searching the archives.