water changes... - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 2 Old 06-28-2012, 01:32 PM Thread Starter
water changes...

I have a 55g thats stocked pretty good . 32 fish few mollys and platys ,cherry barbs,zebra danios,albino cories,and bloodfin tetras. Ive been doing 40-50% water changes weekly and been wondering if i should do two 25% changes a week instead of one 50%. Any pros/cons of doing either or one that is preferred as it still comes out the same? Water parameters are 0 amm. 0 nitrite and 5-10 nitrate 8.2-8.4 ph and pretty heavily planted.
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post #2 of 2 Old 06-28-2012, 02:13 PM
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One really can't change water too often, but most of us find once a week to be enough--by which I mean, we don't want to do more. So a once weekly change of say 50% of the tank is good. If you want to do it twice a week, even better, but change more than 25% each time. Two 25% changes do not have the same effect as one 50%. More frequent water changes will mean more stable water parameters and biology, providing the "fresh" water is close to the tank in GH and pH. Just make sure you stay with whatever schedule you start, as consistency is important.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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