That's interesting. Do you have a pic of the one in your tank? What species are these? I am referring to the ones found in Asia which do prefer powerful flows. Their body structure is such that they are able to hold on firmly in fast flowing rivers otherwise evolution would never have permitted them in that way.thingthing;2678013; said:ive seen hillstream loaches in the wild and they were in a small pond with very little if not any waterflow. there were about 20 of them in about 1square metre. i also have one in my planted tank which does not have very much waterflow and it has been there for 2 years.