I have 500 pcs of Guppy, and I believe I'm among professional breeder in Malaysia, you may not believe but I have successfully created few types of Real Red Eye Albino and several types of Guppy that you can't find in Malaysia market. Here some tips for you to ensure your fry growing fast. 1st, feed them with AZOO 9 in 1 altificial artemia, which cost about RM10 - RM15 a bottle (very small), at least 6 times a day. Change water regularly approx. 3 day once.. make sure your water is safe (clean and chrorine free). 2nd, monitor the water temperature, try to maintain in between 26 - 28 dC. 3rd, after 14 days (2 weeks), feed them with something fresh and live.. I guarantee your expectation within 28 days. Need others info.. just reply me.