Lol I think loaches count as "other fish" :p my brother has two kuhli loaches and I think they're weird! They are cool, though. They move super fast. However they hide in the substrate 99% of the time and I almost never see them.
Um, anyways, lol, I don't think these are those kinds of loaches (I actually think my brother has one kuhli and one dojo, I'm not big on loaches, though, ha, and I know there are other types) but as far as I know, they are pretty peaceful. They are not aggressive/predatory, they are bottom feeders. Although you probably already know that...
I don't really know how to help you get over your fear :p but I'd assume it would go away after time. I've had some pretty vivid and unpleasant dreams, too 0.0