Thank you! My guess was aulonocara as well, but now I know to watch for the coloring of the scianochromis ahli. I will wait a few months and post a new picture here of him.
This worm does not always attach to plants. It can be free swimming and when it does it wriggles very rapidly. I could not get that on video. :( It is a 5 gallon mainly for my shrimp, but right now it has some tetra (I think) fry in it that I took out of the main tank to keep safe. I think...