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  1. #1

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    Default Changing water in large tanks


    1 Not allowed!
    Hi, all. A question: How to those of you with very large (100g +) tanks go about large water changes with chlorinated tap water?

    I am about to do an 80% (more or less) change in the Rainbow Tank to clear out the medication after a long course of antibiotics. There's no way I can use buckets and pre-treat without a)wrecking the substrate, plants, and scape, and b) taking all day to get it done. The best I can some up with is something like this:

    1. Drain the tank to the required level with a serpant
    2. Add enough water conditioner to treat the entire 150 gallons, plus some extra for good measure
    3. Get the tap water to approximately the same temp as the existing water
    4. Fill the tank back up with tap water.

    I've done this a couple times with smaller (30-40%) changes, and the fish showed no obvious distress from whatever short-term chlorine exposure they might have endured. Just wondering if there's a better way.

    Tom

  2. #2

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    Default


    2 Not allowed!
    That is exactly how I do my water changes in all tanks every week. I put a cheapo thermometer in near where the water will pour so that I can monitor temps in case my judgment was off more than a degree or two. Cheapo thermometers may not read an accurate temp but you can still read a change in temp, just give them a few minutes to read current temp before you start adding water back. :)

  3. #3

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  4. #4

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    Default


    2 Not allowed!
    The best way is to add water conditioner to a 55g brute trash can, and then pump that water into the main tank; treating enough for the 55g of water.

    You can add tap water directly to the main tank though as long as you add water conditioner first.

  5. #5

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    Default


    2 Not allowed!
    When doing my large tanks 100g 83g i add declorinator first. Then hook up a manifold to ny hot water cylinder and cold water then run a 60m hose to the fish room and refill.
    Easy and minimal work.

  6. #6

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    Default


    0 Not allowed!
    Quote Originally Posted by Rocksor View Post
    The best way is to add water conditioner to a 55g brute trash can, and then pump that water into the main tank; treating enough for the 55g of water.
    I could see that being a better option, both for decolorization and temp equalization. I'll look into it. T

  7. #7

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    Default


    3 Not allowed!
    Prime works instantly. No reason to use a big container, dechlorinator, then add water to tank. When I had bigger tanks, I always took water out of the tank, but Prime for the full volume of the tank, then refilled. Never had an issue. Why add extra steps when they've been proven unnecessary by so many.
    When I go fishing I just throw sharp rocks in the water and wait for the dead fish to float to the top... Kingfisher
    Everything happens for a reason. Sometimes that reason is you are stupid and make bad decisions.

    I think my fish is adjusting well to the four gallon, He's laying on his side attempting to go to sleep on the bottom of the gravel.
    Imitation is the sincerest form of flattery.
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  8. #8

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    Default


    1 Not allowed!
    He did ask for a better way than adding new water directly to the tank.

    According to Seachem on the directions for Prime.

    May be added to aquarium directly, but better if added to new water first.

  9. #9

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    Default


    1 Not allowed!
    Quote Originally Posted by sfsamm View Post
    That is exactly how I do my water changes in all tanks every week. I put a cheapo thermometer in near where the water will pour so that I can monitor temps in case my judgment was off more than a degree or two. Cheapo thermometers may not read an accurate temp but you can still read a change in temp, just give them a few minutes to read current temp before you start adding water back. :)
    Quote Originally Posted by mac View Post
    When doing my large tanks 100g 83g i add declorinator first. Then hook up a manifold to ny hot water cylinder and cold water then run a 60m hose to the fish room and refill.
    Easy and minimal work.
    Quote Originally Posted by mommy1 View Post
    Prime works instantly. No reason to use a big container, dechlorinator, then add water to tank. When I had bigger tanks, I always took water out of the tank, but Prime for the full volume of the tank, then refilled. Never had an issue. Why add extra steps when they've been proven unnecessary by so many.
    Yep. Drain tank, treat whatever is left in the tank, then add the new water. Easy peasy.

  10. #10

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