In a 10 gallon tank you should set up 1.2 or 1.3 . So far, I have had the best production out of my 1.3 tanks. For whatever reason, I have found that this ratio keeps all of them very involved in the task at hand. I have also found that my females seem to get pregnant faster in a 1.3 setup compared to a 1.2... don't know why, that is just my experience so far.

Mike