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Coloured Gravel Warning

Home Forums Fresh and Brackish Water Fishes Coloured Gravel Warning

This topic contains 4 replies, has 3 voices, and was last updated by  Steve Waring 7 years, 6 months ago.

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  • #300996

    Steve Waring
    Member

    My friend Matt recently tested his pH and found it way to alkaline, we did a Kh test and found it was 11° !

    He did a 1ℓ change every two days with water from my tank which is 6°Kh. After thirty changes, having cycled the contents of this 30ℓ tank we tested again and found 10°Kh.

    On considering the tank, we noticed white showing through scratches on the recently added black gravel. The gravel is the plastic coated sort sold very cheaply at general pet shops.

    We took some out, snapped the bits in two, and poured acid on them. They started to fizz.

    Culprit found. The gravel will be changed and we will keep using my tank for donor water until things stabilise.

    I find the particularly worrisome, because people might be buying this gravel thinking it is good for tetras.

    This gravel comes in all sorts of colours, including bright pink. I assume that none of it is inert.

    The good news is that the rise in ph and Kh does not seem to have affected his six Aplocheilichthys normani.

    #320155

    Matt
    Keymaster

    Cheers Steve.

    #320160

    Eyrie
    Participant

    Nice work on identifying the problem.

    And this further confirms my prejudice against ghastly coloured gravel.

    #320169

    Steve Waring
    Member

    QUOTE (Eyrie @ Dec 29 2010, 12:20 PM) < {POST_SNAPBACK}>
    Nice work on identifying the problem.

    And this further confirms my prejudice against ghastly coloured gravel.


    Minor correction, my water used for the changes is 4°Kh. It’s 6°Gh. I must have been tired when I wrote this. Does not make any difference to the thrust of this warning though.

    I’d left the bits of gravel in the saucer with acid on them overnight, and they had turned to mush by the morning.

    I don’t like most of the coloured gravel either, but I had thought that the black one was acceptable.

    #320361

    Steve Waring
    Member

    The gravel has now been replaced with Tesco Low Dust Lightweight Cat Litter. On clearing out the old gravel, lots of chips of the black plastic were found which exposed what I presume to be limestone.

    Water from my tank will be used to gradually bring down the Kh.

    I have seen black resin coated gravel made from “selected silicate aggregates” which claims to be inert. This is much more expensive than the cheap rubbish that messed up the Kh in my friends tank.

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