Kuhli Loach On Community Creator

No you'll be fine!  The CC is flagging this up due to the length of the fish as you say. Even a very small fish wouldn't fit in the mouth of a khuli and besides it is a peaceful scavenger 

I have had kuhlis with a variety of shoaling fish over the last several years. I have never had an issue with them attacking other fish. If anything, they are the most timid of all the fish - if it comes to a showdown over food, the kuhlis are always the ones to back off. But I have got into the habit of feeding sinking pellets not long before lights out, as the kuhlis are king as soon as it goes dark.

I also suspect that they are the reason I don't really have an issue with snails and rarely find dead fish bodies.