When Do I Change My Fish Tank?

Overview

Objectives/Goals My objective was to see how long it takes before the water in a fish tank needs to be changed. I think that it will take one week before the water in a 2.5 gallon tank needs to be changed, and 10-11 days before the water in a 10 gallon tank needs to be changed. Methods/Materials Two fish tanks, one 2.5 and one 10 gallon tank, with three fedeer goldfish in each. I tested them once a day for nitrate and nitrite, and when the nitrite level got from 3-5 ppm I changed it so there would be no ammonia in the tank because ammonia kills the fish. Every day I wrote down how much nitrite and nitrate was in each tank and changed them when the nitrite level got from 3-5 ppm. Results My results were that a 2.5 gallon tank with three fish in it should be changed from every 5-6 days, and that the water in a 10 gallon tank should be changed every 10-11 days. Conclusions/Discussion My results supported my hypothesis almost exactly. The only difference was that I thought a 2.5 gallon tank should be changed once a week instead of every 5-6 days. My information shows that nitrate and nitrite build up quickly, and that fish have a greater chance of dying in water with ammonia in it.

Competition history

• CSEF 2004 Zoology · Entry J1915

Resources

• CSEF project summary ↗

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