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I haven't used 71B myself, but most of the Lallemand lines are designed to be very low foamers -- in which case, any little amount of foam produced might look conspicuous and suspicious if you're not expecting it. I think you're okay.
I tend to use a lot of 71B. I usually get more foam than that, but it does look like foam. Although for my tests I tend to do the worst thing possible, I swirl the bottle a lot. If its foam, it will break up or get bigger/part of a bigger foam island. If not, you get wet angry mold...
Sure looks like foam to me too!
If you see string-like projections dropping down, you have a fungus going, but from what I could tell in the pics I wouldn't worry yet. It doesn't look like fugal growth.
I also have a small island (about 7 inches across) of this white stuff on the top of a batch of honey/maple mead. It has no legs or roots and only sits on top. This batch is 2 months along and ready to rack. Otherwise the must is clear. I don't think that I need to worry?
Also, I am new to all of this and have a 3 gal. batch going in a 5 gal. carboy as long as my airlock stays intact, should this be alright or will the open area provide too much oxygen? If so, how do I take up the space?
Personally at this late stage I'd get myself another 3 gallon glass carboy if I were you, or Go to a welding supply company and pick up a bottle of CO2 to purge the carboy and top off the batch with if you transfer into the 5 gallon.