These are great!
I have 3 polka dot loaches in my 20 gallon along with 7 tiger barbs and a grumpy red tail shark named Oswald.
Oswald does not particularly care for tiger barbs. He rarely bothers, but if they mess with his food he will chase them off for a bit and retreat back to his den.
I was worried about the loaches with the grumpy old man, but recently have noticed they are fast becoming great friends! They all share his cave now, and they look very cute. The loaches will try to get him to loachy dance in the evening, it's like children trying to drag their grumpy grandpa outside to play!