so i have found out what i feel like makes my guppies pretty big fast this is going on 12 days since they have been born and some of them are starting to show color light color but color non the less. i have been feeding on a regular bases first bites 2 times a day in the morning and the after noon, i feed finely crushed color boosting flakes once every other day. and the day that i dont feed the crushed flakes i feed de-shelled brine shrimp eggs. all the food i have just said i feed M-F and sat. and sun. i feed frozen bbs. i would say they are about a 1/4 of an inch in 12 days i dont know how fast they should be growing but it seems fast to me.