Feeder Fishing

Can my orange tetras live with a feeder fish?

Hello.
I have 2 small orange tetras in my small fish aquarium (the aquarium that comes as a set, with a filter, light, and air pump).
I also purchased a feeder fish (i don't know what kind of fish it is, i just got it for 10 cents at the local Petco) and put it in the tank.
I noticed today, that the feeder fish keeps on chasing on my orange tetras around.
I don't know if they are playing, or if the feeder fish is chasing them, trying to scare them.
are feeder fish normally aggressive?
what should i do?

Your feeders are probably either small goldfish, rosy red minnows or guppies. The only one of these that would be able to live comfortably with the tetras would be the guppies, not for reasons of aggressiveness, though, but because they should be kept in different water temperatures. Tetras are a tropical species, and they should have a water temperature of 76-80o, but the rosy reds and the goldfish prefer cooler water in the 65-75o range. Although they might be able to tolerate the range of the other, one of them isn't going to do as well as it could.

You should also know that the tetras are a schooling species, so these should be kept in groups of 5+. That's not to say you should go out and buy 3 more and add them right away - if you just set up the tank, it wouldn't have cycled yet, and too many fish will lead to ammonia poisoning because your tank hasn't had the chance to cycle yet.

If you're not familiar with the term cycling, please read these links:

http://www.fishlore.com/NitrogenCycle.htm

http://www.fishlore.com/CloudyWater.htm

http://freshaquarium.about.com/cs/disease/p/ammoniapoison.htm

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