04-12-2011, 01:04 PM
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Ok. First, you don't know what kind of fish it is? You said it isn't a molly, why do you say that? Mollies come in many colorations and body forms. Also, you may want to look into Platies (Platy). They are very similar to Mollies.
Next. What fish do you have in your 2.5 gallon tank? Do you still have the 4 fish, or did you take all/some of them back to the LFS? You cannot put fry in with the Guppies, or they will be eaten for sure. I wouldn't put them in w/ montain minnows, either, but I don't know much about them.
Livebearers are hardy fish, if you keep your temps relatively high (above 70), I think the fry should be fine. However, there could be problems if it goes lower.
Also, bowls aren't good habitats for obvious reasons, but for your fry, the main problem is heat (discussed) and oxygen. Bowls don't have alot of surface area when filled. If you use a bowl, you should only fill it half way (or where the surface area of the water is the biggest). Some people will also use airstones. I cannot recomend them because I don't know what type you want so that you don't blast the little fry around all day. Maybe someone else can recomend something like that.
If you have any more questions, don't hesitate to ask.