partial water changes. If you have no water sitting now to put in that tank, could could pick up a gallon of drinking water (not distilled, not baby...) next time you are at the grocery? Siphon a gallon off of the tank's bottom - that gets a lot of fecal material out and then, making sure that the gallon is about the same temperature (or a tad warmer) than the tank, gradually add it.
At the moment I have 4 siphons going. Basically hard & soft airlines are running from gallon jugs (cut off at the top to make pouring in and out easier.) That provide a change which is rather gentle in terms of any chemical differences in the water and also it doesn't roil things up.
When that jug's water is used, put a dab of whatever water conditioner was recommended in. Fill it up. Leave it open (always offers exciting possibilities with little tykes around) so that a little free oxygen can get in and free carbon dioxide can get out.
In a day or three or seven, siphon out a gallon of water and replace it. Assuming that the water is safe and warm. a person can not make too many daily partial water changes. :)
Should you got to a 10-gallon aquarium, get 4 water jugs. ;) Start that tank cycling with just two or three guppies.
Temperature was mentioned. Heating tiny tanks is always tricky. If these are fancy guppies, would their temperature be in the 76-78 F. neighborhood? Higher and they can be a little more aggressive. Lower and they are vulnerable to chills and outbreaks of Ich.
Submersible heaters are a little bit more expensive but more durable and efficient. Still I wonder how many of us unplug them before we fiddle with a tank.
The so-called common guppies are hardier. But many times, especially if they were in the feeder guppy tank, they need to be treated with something recommended for internal parasites. Should you keep your 3-gallon tank and get a larger one, the three might be used as a quarantine tank for new fish, their first few weeks in the family. Towards the end of quarantine, treat with Fluke tabs (broken to fir the gallons available) or a comparable anti-parasite med.
There are a couple of small but good books out on guppies and livebearers.
Stan Shubel's Aquarium Care of Fancy Guppies (Hardcover, 2006. TFH Press) in a new entry, listing at $9.95. It seems to be in the big box book stores around here. And they replaced it when I bought a copy. ;)
Guppies, Mollies, Platys and Other Live-Bearers: Purchase, Care, Feeding, Diseases, Behavior and a Special Section on Breeding: Harro Hieronimus
Paperback, 1993 (Barrons Press)
Maybe take a look at http://product.half.ebay.com/Aquarium-Care-of-Fancy-Guppies_W0QQtgZinfoQQprZ54037437
Depending upon how old your daughter is, you may have to edit (summarize) what is on a page. The images are good, as is the info.
And speaking as a long time school teacher, reading with your kids, from an early age, as you undoubtedly know, is one of the best things you can do for them.
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