Newbie's Tiger Barb has a split fin.

Thanks in advance; I have so much to learn!

One of my green tiger barbs, lets call her Sparkle, has a fin that seems to
be split into 3 or 4 separate pieces. It is one of the two on the very
bottom, the ones that are either red or black depending on the fish. I
noticed that she was spending all her time hiding bottom rear back next to
where the temp strip is on the outside, but she's been coming out to eat, if
only a little after the others get started. This morning I noticed the
damaged fin. I don't know how long it has been this way because she's been
hiding in a hard to see spot.

Will this heal? Anthing I can do to help her? She doesn't seem to be in
pain but she just stays in one spot most of the time.

About 2 weeks ago my PH got high, but it is under control now (I am more
thorough i testing after a water change) and all other parameters are good.
Tank is a 37g tall with some live plants.

My fish a
6 tiger barbs (3 green, 2 wild, 1 albino)
1 red-finned black shark
4 little cory cats
2 blue flame tetras (aka colombian tetras?)

I just added the tetras and 2 cories 2 days ago. I moved around the
decorations, but the shark still got a bit riled; could he/she have hurt
Sparkle?

Regards,
--
Dave Peck

P.S. I don't really know if she is a girl, but with a name like Sparkle, I
am hoping. Is there an easy way to tell?