Tropical Fish Forums
Aquarium fishkeeping around the world!
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| Which water change routine will keep his nitrate below 40 ppm? |
| I have no idea how to solve this |
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14% |
[ 7 ] |
| 10% every week |
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2% |
[ 1 ] |
| 20% every week |
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47% |
[ 23 ] |
| 25% every 2 weeks |
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16% |
[ 8 ] |
| 30% every 2 weeks |
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12% |
[ 6 ] |
| 35% every month |
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2% |
[ 1 ] |
| 40% every month |
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4% |
[ 2 ] |
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| Total Votes : 48 |
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| Author |
Message |
Dawn
Benefactors
Joined: 05 Feb 2003
Location: Raisinville, MI, USA
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 Posted: 2003.08.18(Mon)13:19 Post subject: |
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I knew 40% was wrong after I voted, but you can't change your vote. If you want to figure it by days in the month it's usually 4.33 (if I remember that right). See what happens when you're too lazy to actually write things down.  |
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Cyradia
Benefactors
Joined: 06 Feb 2003
Location: Winston-Salem, NC
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| Posted: 2003.08.18(Mon)13:30 Post subject: |
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Yeah, and after all of my math, I ended up punching in the wrong vote. I used a spreadsheet to check my math, and the way I set them up was a column of what you're taking out, and then a column of what's in the tank. I actually voted for the 35% because that number was approaching 40...but I had looked at the column which was how much nitrate are you taking out instead of how much is in the tank. As soon as I hit the vote I realized my mistake and knew it was 25%, but you can't change your vote.
Blast it all...doing the math right and being outsmarted by the html buttons!
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nonamethefish
Moderators
Joined: 06 Feb 2003
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| Posted: 2004.04.13(Tue)21:53 Post subject: |
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So you mean this math stuff comes back to get you?
*groan* |
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Marcos Avila
Moderators
Joined: 05 Feb 2003
Location: Santo Andre (Brazil)
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| Posted: 2004.04.13(Tue)23:07 Post subject: |
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Noname, are you alright? Any particular reason why you added that little comment to a topic that's almost 1 year old? 
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Success with a fish/tank is measured in YEARS, not months or weeks... |
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Kunnagh
Regulars
Joined: 28 Jul 2003
Location: Bristol, UK
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| Posted: 2004.04.14(Wed)6:33 Post subject: |
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| Quote: | | Noname, are you alright? Any particular reason why you added that little comment to a topic that's almost 1 year old? |
A great addition to a maths poll thread! After discussion about whether 25%, 30% or 20% of water being changed, and 25% being considered correct and none of the others, Professor Avila, who sets these devilish problems, declares that 65% of a year is 'nearly a year'.  We should all expect well over 30% leeway in any answers we submit for marking from here on in! 
Meanwhile, I've just started reading this book and so might feel confident to actually post a sensible reply next time!
Cheers!
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Drink deep, or taste not the Pierian spring |
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nonamethefish
Moderators
Joined: 06 Feb 2003
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| Posted: 2004.04.24(Sat)12:38 Post subject: |
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Well, it was only on page 2 
It looks like good article material...maybe make it so normal people can understand it though! LOL |
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