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  1. #1

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    Default Please help, fish dying?


    0 Not allowed!
    So I've had a 36 Gallon Freshwater tank for about 2 years now. I have an assortment of Rainbowfish such as my one Trifasciata Rainbow. The last instance I had a fish die was a little over a year ago and everyone else has been fine since. However, my Trifasciata has begun to act strangely. He normally was a ravenous eater but is now eating only a couple Spirulina flakes if they happen to float his way. He'll either be hanging out at the top of the tank with his tale drooping down or he'll be very close to the gravel. As of late, I've had a few problems with nitrates (over the past month or two, I've been slacking a bit on water changes). Is this the problem??? Should I do a few large water changes or 20% every day or what???

  2. #2

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    I would say do 20% every other day. Don't forget to keep testing your water. What are your readings? He could be feeling the stress from the higher nitrates.

  3. #3

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    what is the ntirate reading now? what are the ammonia and nitrite readings?

    If you miss a couple of water changes just recently this month, when you were previously doing weekly water changes, a large water change will have no ill effect. In fact, it would have a positive effect.

  4. #4

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    Here is the math needed to figure out how big of a water change to do. It's the same for ammonia, nitrite and nitrate. I do 80% weekly water changes on my 75 gal.

    Desired reading, divided by current reading, minus 1.0, times 100 equals the % of water to change. Very simple math.

    10 gal tank, high nitrate example –

    10 (desired reading) divided by 40 (current reading) = 0.25 - 1.0 (-0.75) X 100 (75) = 75% water change. With a nitrate reading of 40 you need to change 75% or 7.5 gal. Nitrates of 40 ppm X 75% water change = 30 ppm ammonia reduction. 40 - 30 = 10 ppm after the water change. Simple.
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  5. #5

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    Where would you adjust that formula to adjust if you had say like example 9.00 ppm to account for nitrates on the tap

  6. #6

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    You would need to know your nitrate reading before your water change. What is it?
    75 gal - Smudge Spot Cories, Silvertip & Pristella Tetras, Scissortail & Red Tail Rasboras, Pearl Gourami, Black Kuhli Loaches, Whiptail Cats, Wild Caught BNP
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  7. #7

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    0 Not allowed!
    Quote Originally Posted by gronlaura View Post
    You would need to know your nitrate reading before your water change. What is it?
    say it was a 30 gal or 75 gal for example with a 40ppm nitrate test reading before doing a water change except the water off the tap was a 9 was just curious how you would adjust that formula, as i followed it just not sure where you would do the adjustment for the 9.00 thats in the water your adding back, would you subtract that from it some place ? or adjust the percentage say -0.75 in your example by some factor to account for whatever the tap water your using reading was . sorry i suck at explaining math.

  8. #8

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    Ok, here goes. You would try for a nitrate reading of 15 after your PWC.

    For a 30 gal - If you change 80% (24 gal, numbers are based on a % of the tank size, 30 gal) -
    24 gal new water at 9 ppm nitrate = 7.2 nitrate reading for the changed water (9 x 80%).
    6 gal existing tank water at 40 ppm nitrate = 8 ppm nitrate in the tank (40 x 20%). 7.2 + 8 = 15.2 nitrate reading after the 80% PWC.

    For a 75 gal - If you change 80% (60 gal) - again, the numbers are based on a % of the tank size, 75 gal. Your readings would be the same, just the number of gallons changed is different -
    60 gal new water at 9 ppm nitrate = 7.2 nitrate reading (9 x 80%) for the changed water.
    15 gal existing tank water at 40 ppm nitrate = 8 ppm nitrate in the tank (40 x 20%). 7.2 + 8 = 15.2 nitrate reading after the 80% PWC.

    Do not be afraid of an 80% change. I do it every week.
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  9. #9

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    Yes, you would need to use weighted average.

    I've derived a formula for that where "A" is your desired level of nitrate in the water column, however, A must be greater than Tap. The equation gets you to how much water change is needed.

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  10. #10

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    Quote Originally Posted by gronlaura View Post

    Do not be afraid of an 80% change. I do it every week.
    I do probably 65-70% on all 4 of my tanks, once a week.
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