Well, there's the obvious “I want those loud and annoying intruders out of my home“. As I discussed before this motive seems plausible at first but it raises many questions regarding it's behaviour at the time of Balin's colony. Then there's the possibility that Durin's Bane noticed, and was provoked by, Gandalf's presence which didn't happend the first time Gandalf went through Moria. Theoretically speaking, the Balrog may have been in the service of Sauron and alarmed by him about a certain party which may try to travel through it's realm. I guess those are the most likely motives for the Balrog to confront the fellowship, aside from the discussed “Ring“-explanation.
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