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I need advice about my predator tank filtration :)

Discussion in 'Predatory Fish' started by hmmmmmm., Jul 18, 2017.

  1. hmmmmmm.

    hmmmmmm. New Member

    Jul 16, 2017
    Likes Received:
    Hey Peeps,

    I have a 375 Gallon Tank with currently:

    9 big goldfish
    1 baby silver arowana
    3 baby motoro stingrays
    6 medium discus

    All living happily ^^

    I have a 5x2x1 sump for this tank with overkill amounts of bio balls, marine pure and purigen. However, the water is always hazy. It is not cloudy, but not crystal clear either and I dont see any reason for it not being so. I have a 4 stage foam prefilter for my sump. I dont overfeed either.

    I have a UV system on the way for the tank but looking at a few videos online, I am skeptical about it's performance in the clarity department. I have it primarily for safeguard against parasites as my fish are very expensive (fish cost a lot in Aust).

    I was thinking of adding a fluval fx6 as a mechanical filter to the tank to polish the water. Is that a good idea? or is there something else I can try first

  2. eaglesaquarium

    eaglesaquarium Life, Liberty & Pursuit of the perfect fish tank
    Staff Member Moderator Global Moderator

    Apr 4, 2011
    Likes Received:
    That's not a very good mix of fish, honestly. It isn't about temperament, it's about water parameters. First, discus require extremely clean water and virtually no nitrates. A planted tank works well for them where the plants take up the excess nitrogen quickly.

    Meanwhile, goldfish aerie extremely 'dirty' fish, with a high rate of waste.

    Exacerbating this is that discus are best kept in very warm water... about 80F or a bit more. Meanwhile, that is too warm for the 'cold water' goldfish. Goldfish kept in those conditions long term accelerate their metabolism, speeding up their rate of waste production (see the first issue) and dramatically shortens their life span.


    As for the haze, get the goldfish in the right spot and the cloudiness will likely decrease.
    #2 eaglesaquarium, Jul 18, 2017
    Last edited: Jul 18, 2017

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