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One of the more important points about raising guppies is to make sure you get your fry off to a good start. Keeping them in a trap or small container too long is a typical mistake that can stunt the growth of your fry. This can result in a fish that will never reach it's full potential.
Of course feeding, water temperature and conditions will all effect the growth rate of your fry.
Keep them warm- 80 degrees or more. Live brine shrimp is considered the best food, with a varied selection of other foods being fed as well.
One point many breeders don't realize is that the guppy spends more energy on growth in the first month of life than at any other time. This is because, basically, that is all the fish is doing at that time is growing. After 5 or 6 weeks, much energy is spent on sexual devepment, and sex itself. By 3 or 4 months, the fish are expending growth energy towards the development of fins as well.
So it is crucial to start your fry off right, and get as much size on them as you can in the first month.
This will help you raise qality fish that will reach their full potential.
Also, be sure to observe your young fish closely. You will want to cull any deformed or sickly looking fry as soon as you notice them, usually by 1 month or less. This will prevent this type of male from impregnating any females in the tank.
A combination of heavy feeding (but not overfeeding) and frequent water changes will help your fish grow faster, as will a higher water temperature.
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