David,
I had a hillstream loach in my 4ft coldwater tank for seven months, then it went and died on me. Initially, it did a great job of cleaning the algae from the tank glass and rockwork but eventually slowed down without putting on any size that I could make out. Latterly it prefered to eat the food I was adding for the WCM minnows, weather loaches and goldfish and stayed in its cave outside of feeding times. Am sure this was pure coincidence but after I added a pair of garra pingi pingi, the hillstream loach was dead within 2 weeks.
Still, the garras are a lot more fun and do a lot more algae cleaning than the hillstream loach!
I would have expected them to be quite territorial, many bottom feeders are, how many do you have in that 20g? How long would you expect them to live for?
Good luck with your attempts to breed them, be sure to let us in on your progress because there's not much information out there yet.
cheers
David
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