I have been tossing around the idea of a loach tank for some time now. I currently keep and breed plecos and cory cats so, I know about catfish but, I have never kept loaches. What would be the best loach to start with for a 75 gallon tank? Are there any loaches that breed in an aquarium setting that can be kept in a 75? I would like this to be a single species tank. So, what loaches do best in groups? I know that most loaches come from streams so, what kind of flow will I need in a 75? What is the best substrate for loaches? Thanks in advance for any help!