I have read that if the ph in the tank is more than 7 all of the fry will be male and if it's below 7 they will all be female. How sensitive is this because my ph is 7.4 so will I get all male or could I get some female as well as it's not that far over 7. Also do you recommend keeping the fry with their parents to grow up naturally or taking them out and putting them in a separate tank