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Old 12-05-2006, 08:47 PM   #1
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PWC and when to do them?

Currently i am doing partial water changes of 15% every two weeks. i only have one fish right now so my nitrAtes stay at zero.i have heard that partials were only necessary to remove nitrates are there other beneficial factors to doing them? Can i stop doing them until i get readable levels of nitrates?
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Old 12-05-2006, 08:59 PM   #2
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PWCs will replenish your depleted trace elements. They are VERY important. Don't wait till you have problems to do a PWC. I like to premix mine for at least 24 hours. This is my schedule:
Fri-add salt/water/heater/ph
Sat-test water/add salt/water if needed
Sun-remove old water/clean equip in old SW/pump new water into tank
This premixing will allow you to adjust your premixed water to your main's parameters, especially pH, salinity and temp.
There are more critters in your tank that you can't see and water that is out of whack can cause even more problems. It is also a great to practice measuring salt/water combo, especially if you need emergency PWCs. I would also invest in a QT. I would hate to see that 135 gal get wiped out by ich or poor water qualities.
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Old 12-05-2006, 09:28 PM   #3
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I agree that they are very beneficial to replenishing valuable trace and essential elements. They also as you mentioned dillute nitrates and DOC`s that fuel bad algeas. I do mine every week religiously.
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Old 12-05-2006, 10:00 PM   #4
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I do mine every three weeks, unless I have a problems, like the hair algae I am having now. As mel said, I think I have some DOCs, from my source water. I have ordered a TDS meter and an RO/DI unit.
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Old 12-05-2006, 11:30 PM   #5
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15% every two weeks a great maintanance schedule. With a small bioload and no detectable NO3, you may be able to stretch it out to 3-4 weeks at most. I would not go beyound that. As mentioned, PWC bring much more to the party then excess nutrient removal.
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Old 12-06-2006, 12:24 AM   #6
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~~~EDIT: I'm a moron-my tanks are FRESHwater! Please ignore completely.~~~

I do 50% a week, but sometimes I think my tanks have more fish than water in them....
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Old 12-06-2006, 08:56 AM   #7
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Quote:
Originally Posted by plecoperson
I do 50% a week
Doing pwc greater then 30% in SW is fairly risky due to all the levels that can change drastically like ph/sg/temp/alk and can have a very adverse affect on inverts. If fish only and you match ph/sg/temp very accurately it's usually not an issue though. I'd seriously reduce your bio-load if having to do that large of a pwc each week.
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Old 12-06-2006, 09:56 AM   #8
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Quote:
Doing pwc greater then 30% in SW is fairly risky
The risky bit is that I didn't pay attention to this being the SALTwater forum! Mea culpa--
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Old 12-06-2006, 10:35 AM   #9
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It`s OK Lisa. Dont worry about it.
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Old 12-06-2006, 10:36 AM   #10
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I noticed you mostly post in FW I figured you were thinking about FW pwc where 40+ no3 ppm and 50% pwc are much more common and pose little risk.

I only warned about it to keep new SW owners from doing such large pwc without knowing the risks involved.
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