And make sure they know that soap is not involved. ;) Then explain cycling to them. :)
TFH for April came today. One of the cover stories indicated an article on "Mini-predators." One little voice in me said, "Ooh! Ooh! Just what we've been talking about!"
With considerable curiosity I turned to "Pocket-Sized Pikes", already developing a half correct guess as to what that would be about. The article wasn't about keeping a flock of livebearers to size. Indeed most of them - pike cichlids, a natural predator of guppies; the pike characin, related to the tetras and able to eat many of them; needlefish; Central America's (and now Florida's) Pike livebearer, already a natural predator on small livebearers, tetras and cichlids; and "rocket gars" or "freshwater barracuda" Ctenolucius hujeta (which of course are neither of those fish, but another South American pike characin) can all take adult guppies. Fortunately they can be trained to take earthworms, crickets, mealworms and eventually slices of whitefish.
One of their "pikes" is a killifish from India, in the old books called the Malabar killifish. You may have seen a color sport of them in the shops = the golden wonder killie. (For an account of how it was developed see http://nzka.fnzas.org.nz/ )
I have a wild strain of it now, the so-called red form. They are great jumpers and must be in a tightly covered tank or they will quickly succumb to terminal dehydration. This is redder than mine, but sort of gives an idea of what Aplocheilus lineatus can look like.
http://www.aquatropica.be/aquatropica/articles/aplocheilus/aplo_lineatus.htm
They are also prolific breeders and lay big eggs. Their's were the killie whose eggs I used to teach our kids how to pick eggs - at the age of 2 1/2.
They are a good example of if it can fit into the mouth, but are pretty gentle towards larger fish. Indeed I made the mistake of putting three of them into a 29-gallon tank with a pair of like-sized pike livebearers (Belonesox belizanus). I had to remove the pummeled killie soon after!
The books and hobby often suggest that one can't get fry to grow in a tank of adults and I've seen that disproved several times. However, just because a species tolerates a few of it's own fry, doesn't mean that it tolerates the fry of another species.
I think you would get no guppy fry in that tank. Ok, maybe not a good idea after all.
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