Best way to Lower SG

Discussion in 'Water Chemistry' started by crustytheclown, Feb 22, 2012.

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  1. crustytheclown

    crustytheclown Eyelash Blennie

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    Ok I've got 1.028 in my 10 g tank. I was gonna do my regular water change today but I need to lower the SG back to 1.026.
    So what's the best way?
    1. Replace current aquarium water with fresh ro to lower Sg to 1.027 today and than do a 2.5 gallon wc with a salinity of 1.026 tomorrow to get back to 1.026.
    2. Do a large 5gal wc at 1.026 to get to 1.027 and than do another 5gal wc of 1.026 to get back to 1.026 in the tank.
    3. Lower the salinity of my wc enough to target 1.026 in my tank and just do one change.

    I normally only do a 2.5 gal change weekly. Would a larger change hurt my tank?
    I'm thinking the last one is the worst way.
    If I choose #2, will my tank be ok at 1.027 until next week when I lower it back to 1.026 in the same way?
    If I choose #1, how much water should I remove from the tank and replace with ro to get to 1.027?
     
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  3. zoo 4 life

    zoo 4 life Coral Banded Shrimp

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    The best way is number 2 without a doubt. Any other way and you risk lowering the S.G too much and stressing out the fish, I think your tank will be ok where it is for a week. Remember, only bad things happen fast in this hobby!
     
  4. cosmo

    cosmo Giant Squid

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    I'd just do regular 10% water changes at 1.026! Like 1-2 gallon changes! Just do 3 or 4 of those over the course of a week! Less shock to the system that way!
     
  5. FaceOfDeceit

    FaceOfDeceit Hockey Beard

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    The correct answer is 'slowly'. You can do smaller changes, 2-3 gallons, every other day for a week (4 total changes). That should bring you down slowly enough to not shock any living inhabitants.