11-25-2012, 04:52 PM
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Large water changes really depend on the tank/fish. Our Lake Tanganyika fish don't like ph swings so not a good idea for them. But I have done 50% WC on all of our other tanks with no problem whenever the nitrates were high. I've been told that up to 100% water replacement within a weeks time is ok. We tried API NitraZorb and Seachem Purigen in our 220 and 120 and it brought the nitrates down, but it was not immediate. Decided not to continue using the products after recharging them a few times because it was a lot of trouble. We are looking into Seachem Matrix to lower nitrates because all of our tanks are over filtrated with lots of water movement (spray bars, power heads, etc.) This swift moving water does not allow areas of "still water" for the anaerobic bacteria that is necessary to eliminate nitrates to grow. Matrix is a highly porous media, basically like a rock with lots of tiny holes in it I think. I have done so much research and this product seems to make more sense to me. We can't do plants, our fish would tear them up. Also, if you use Prime water conditioner and de-chlorinator, the Prime will neutralize the Nitrates so they are less toxic to the fish. Dose Prime equivalent to the entire water mass of your tank when you do a water change, regardless of how much water you remove/replace.
Last edited by lakemalawifish; 11-25-2012 at 04:55 PM..