It's hard to tell, but it looks small. Juvenile black racers aren't black, they darken with age. Might be that... but this is definitely not a positive ID.

I doubt it's dangerous.

It is the elusive upside down snake :-)

I agree with Thetraditon.

I believe you've got a juve. black racer there... But I'm no expert.

Barbie~

I don't like the white I'm seeing on the belly area. Maybe a water moccassin?

The head and the markings are all wrong for a water moccasin.

I'm glad! I never saw white on a black racer in the 14 years I've lived here.

photo fixed

Here, I adjusted your photo a bit so that more detail is visible:

Definitely not a moccasin. The head is all wrong. I might be willing to agree on the black racer, but the young ones I've seen about this size (basing size on the rubble and debris) usually have more grey and more defined blotches in the pattern. Still, it could very well be one that has started darkening early... Yeah, I'll go with Juvie Racer that needs to lay off of the tanning booth. It's the only thing that really comes to mind looking at him.

Thank you all! Thank you love_the_yard and writersblock for fixing my picture. I just logged on from my computer and saw it was upside down! I posted it from my phone because my hubby was for sure it was something poisonous even though I told him I thought it was a young racer. I knew you all would know!
Thank you!

Is it a pygmie rattler?

No, not a rattler either. Even at this age, the head is too rounded to be one of the pit vipers (which covers all the poisonous species in Florida with notable exception of the Coral). It also lacks a lot of the coloration that a pygmy rattler would have and the tail is too long. While a rattler hatchling might not have its rattles yet, it's tail would be shorter than this one's.

Baby black racer-harmless- do not kill