awww...dont let em die. you can keep the ones you have and still be happy...you just have to make sure you change the filter cartridges once a month ($3.00), do weekly water changes (1-2 gallons) feed the fish every day, and have some type of water conditioner (Stress-coat, prime, etc, $6-$9) and you should either have a test kit (strips-$10 or master-$30) and test your tank weekly. it becomes easy once you get into the hang of it. i believe you could do it on your allowance easily. just set a few bucks aside every week so when you need something you can get it. also, most fish stores will test your water for free. dont give up on your fishies. they need you!
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