08-04-2012, 11:30 AM
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Getting some good advice here. Fish are probably the most complicated pets ever- though no store will tell you that. Listen to Byron, your fish species are hardy so they may pull through.
However, I would look into getting at least a 25-30 gallon tank eventually to help the fish, such a small amount of water and so many fish is probably the main problem.
Right now, I would change 75% of the water in the aquarium. Use water conditioner, and try to make sure the new water is close to the temperature of the aquarium. Don't clean your filter out either, I know they tell you to change the cartridge but it's not something you need to do.