i use one 10 gallon with 5 large mature females (almost 3 inches for the largest)..and two males heavily planted, and over filtered, i get about 90 fry per female and i do not remove them..i would say about 20% might get eaten no more....i scoop them out when they are about 1/4 inch...(3 weeks ish) dump them in to a 5 gallon grow out till 1/2 (another 2-3 weeks) and them dump them all in to my planted sculpin tank..where some are demolished early..while others live and grow for a few weeks.