This is pretty cool. When viewing a photo in your
FishLore Gallery you'll notice the "Linked Thumbnail" box which contains the code needed to paste a thumbnail version of that photo into a post on the forum. It links to your gallery too. See attached image for the location of this box.
Just click in the box, press ctrl + C to copy or right-click and select copy, then paste the link into a post.
Example linking to capekate's angelfish:
There is a also a little icon:

to the right of the "linked thumbnail" box that you can click on to get some more link types.
Very cool.