red-tail sharks and kuhlis

Anyone have any experience with a red-tail shark and kuhli loaches? A friend of mine has 30g tank with a red-tail and would like to add a small group (I guess 3-5) kuhli loaches. We've found plenty of info on cory cats going in with that shark but no info on the kuhlis.
Thanks!

Even if you don't have direct experience, I'd be grateful if you could share any info concerning this.
Thanks!!