Treated Wood - Not sure!

[Jeff]

Ok, so I may have made a mistake. I purchased two 10' pieces of Douglas Fir from Home Depot to support my grow beds above the fish tank. However, I have NO IDEA if it's been treated or not. Here is a picture of what the label looks like.

As you can see, it does have the acronym "BTR" and "GRN". Do you know that means it's treated or untreated?

If it's treated, or if you don't know, then do you think wrapping it in bubble wrap would be an adequate solution to prevent it from seeping into the tank? I was thinking of wrapping the wood which is above the tank in the bubble wrap just in case, but if you guys can make any sense out of this label on the wood, and if you have information that it's NOT TREATED, then I could save the time and not wrap the wood to protect the tank.