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Thread: Adding Formalin to prevent egg fungus

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    Default Adding Formalin to prevent egg fungus

    Hi quick question regarding Formalin for egg fungus prevention.
    Is it best to mix in a cup with water and pour it into the tank or just add it directly to the tank with a pipette
    Regards Assad

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    Registered Member smsimcik's Avatar
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    Default Re: Adding Formalin to prevent egg fungus

    It doesn't matter either way. The most important thing is to get the right concentration ( about 1500mg/liter) for the right length of time ( 15 mins./day). If you use too little or too much formalin, you won't be successful.
    Why are you using formalin instead of peroxide or methylene blue?

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    Default Re: Adding Formalin to prevent egg fungus

    I read on some forums that it was good for preventing egg fungus and that 1 dose was all that was needed.
    I was going to use Methylene Blue but read that it was not advisable with TDS below 60
    Regarding the formalin do you add it 15 minutes after they have finished laying the eggs

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    Registered Member seanyuki's Avatar
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    Default Re: Adding Formalin to prevent egg fungus

    To be applied to fish eggs for 15 minutes.


    Quote Originally Posted by assadp View Post
    I read on some forums that it was good for preventing egg fungus and that 1 dose was all that was needed.
    I was going to use Methylene Blue but read that it was not advisable with TDS below 60
    Regarding the formalin do you add it 15 minutes after they have finished laying the eggs
    Grasshopper
    Francis

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    Default Re: Adding Formalin to prevent egg fungus

    Oh. I added 1 drop per gallon 15 minutes after they finished laying and the following day I did a water change.
    I didn’t know you only leave the formalin in for 15 minutes
    Next time I’ll try Methylene Blue
    What is the best way to dose with MB
    Thank you very much in advance for your help

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    Registered Member seanyuki's Avatar
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    Default Re: Adding Formalin to prevent egg fungus

    For chemical treatments, best to follow the label instructions......I usually add MB one hour after the eggs are laid.


    Add 1 teaspoon of 2.303% Methylene Blue per 10 gallons of water.

    http://www.kordon.com/kordon/product...ctions-for-use!
    Grasshopper
    Francis

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    Default Re: Adding Formalin to prevent egg fungus

    Do you still do daily water changes, or do you wait till they hatch then start the water changes

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    Default Re: Adding Formalin to prevent egg fungus

    Update
    Added the stated dose of MB and it turned the water a very dark blue, to the point you couldn’t see anything.
    It spooked the discus and they went and hide behind the sponge filter.
    They totally ignored the eggs.
    Waited for about 6 hours and decided to do a 50% water change.
    After doing a water change the discus have made an appearance and have started guarding the eggs again.
    I suppose half dose is better then no dose.
    The reason I’m adding MB is I’m using a cone guard.
    Regards Assad
    Last edited by assadp; 04-21-2021 at 05:39 PM. Reason: Additional information

  9. #9
    Moderator Team LizStreithorst's Avatar
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    Default Re: Adding Formalin to prevent egg fungus

    When I've used meth blue I have lifted the cone out of the water, dribbled a few drops right on the eggs then put the cone back with the parents.
    Mama Bear

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    Default Re: Adding Formalin to prevent egg fungus

    That might of been better
    I think I’m going to do another few water changes to reduce the colour to a pale blue

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