11-08-2006, 07:09 PM
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How big is the tank? How much is in there for decorations. Typically other fish will eat fry in a community tank if they can find them. The easiest way to keep them alive without the extra hassle is to put A LOT of decoration in the tank, covering from top to bottom in thick plants. This gives the fry a safe place to hide at all ranges of the tank where they need to go, especially the surface, so they can feed.
For feeding guppy fry, simply crumble some of the flake food when you feed at night. They will eat this fine, and there is no need to purchase specialized food.
As Joe has mentioned, guppy fry will become a nuisance in a smaller tank at some point. Guppys (and other livebearers) can have up to 30 fry at a time, and they can do this every 30 days. Any female coming from a sales tank with males in it, is likely to be pregnant. When transferring fish from store tank to home tank, if it's allowed to hit the air for even the briefest moment, this will usually cause premature birth of the fry. If it were mine, I'd let it alone and see what survives as it is, knowing that soon enough there will be plenty of fry to pick from.
One last note... 1 female guppy with 1 male guppy in the tank will usually mean the loss of the female guppy not very far into the future. Their favorite activity is breeding, and without a 2nd female to chase, the male will chase this single female until she dies from simple exhaustion. If there is space enough in your tank for another fish, you might want to consider adding another female. If not, then you might want to ask the LFS to take back the female and replace it with another male guppy to prevent breeding problems.
I hope this helps.