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Old 01-31-2007, 10:25 AM   #11
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The answer to "How big a water change do I need" is almost always "By what percentage do you need to lower your nitrate level?"

If you feel the need to reduce nitrates by >50%, you should think about doing it in steps, with a day or two taken between steps.
One 50% PWC=50% reduction in nitrates.
Two 50% PWCs=75% reduction in nitrates.
Three 50% PWCs=87.5% reduction in nitrates...
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Old 01-31-2007, 10:36 AM   #12
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Do you have sponges in your canister? I have a fluvial and it had 4 sponges, they tend to become nitrAte factories (I removed them two at a time). I also clean my filter, in old SW when I do PWCs. They tend to build up gunk and I needs to be removed. The GAC and other filter media will also store up gunk and help to produce nitrAtes.
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Old 01-31-2007, 09:54 PM   #13
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Thanks for all the help with the nitrate problem. I cleaned out my filter today. I retested for nitrate and came up withe .10 so I didnt do another water change. Now my PH is at 7.8 and I know that is too low. Will this take care of itself or do I need to add something. It was at 8.4 before the water change.
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Old 02-01-2007, 11:06 AM   #14
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Did you premix your water for at least 24 hours?
Do you have a cover over the tank?
You can adjust your phs to cause more surface ripple, this should increase your pH.
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Old 02-01-2007, 12:24 PM   #15
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Quote:
Originally Posted by Ladybus301
Now my PH is at 7.8 and I know that is too low.
That's still within acceptable range (7.8-8.4). Rapid changes (up more then down) will harm your stock so I wouldn't do anything at this point.

As Scott mentioned proper circulation and an open top will keep it from falling but I wouldn't worry about the current level and just keep doing regular pwc. It will level out slightly higher within a couple of weeks if not sooner.
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Old 02-01-2007, 01:34 PM   #16
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I agree dont panic as far as the PH. Unstability is a worse factor at this point. Keep doing frequent PWC`s and you`ll see it stabilize. Hope all goes well
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