Which Rock(s) Messed Up My pH?

About a month ago I added three rocks (well, 2 large and several small
matching ones) to my aquarium and a few days later my male dwarf
gourami began to loose color, stop building nests and won't spawn.

Here's his photo, he looks pathetic...

http://static.flickr.com/59/159533615_457de25328_o.jpg

I know NOTHING about identifying rocks and stones so I'm posting their
photos in hope that someone can tell me which one(s) altered my pH.
(Was 6.9 and is now 7.7)

I was hoping the gourami would grow used to the new pH but he's still
pale after a month. The rocks are holding up an embankment so if it's
just one rock that is the culpret I'd rather just remove the one rather
then the entire grouping.

We'll call this rock 1:
http://static.flickr.com/77/159533616_f8f5131e2a_o.jpg

Rock 2:
http://static.flickr.com/53/159533617_fa90333f8d_o.jpg

Rock 3: (one of several)
http://static.flickr.com/75/159533618_f46d99a14b_o.jpg

Thanks guys n gals. I know it's not really a 'plant' question but
you'all seem to know a lot about these aquascaping things.

Christie