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    The "one inch per gallon" rule

    Discussion in 'General Aquaria Discussion' started by guppy, Aug 30, 2007.

    1. crayfishlobster

      crayfishlobster Jack Dempsey

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      I know, but some fish are really active. if u want a happy arowana for life get at least a 375 gallon or better a 400 gallon. I am also talking about the people that think it is only about length.
       
      Deadliestviper7 likes this.
    2. ozliosoma

      ozliosoma Jack Dempsey

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      I have always wondered how this worked. Thanks for everyone taking time to explain.
       
    3. itrebebag99

      itrebebag99 Plecostomus

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      Well, lets just be fair here, most orandas (or any other fancy goldfish) won't get half that big. A goldfishes size is almost entirely dependent on environmental conditions, not genetics. A goldfish requires warm water, lots of food, lots of water changes, lots of water changes, and lots of space to have a chance at growing that big. Not exactly reasonable to assume that an oranda will grow that big in a 29 gallon, and outgrow the aquarium. I know this isn't exactly your argument, and is slightly besides the point, just wanted to point this out.
       
    4. Alphonsus

      Alphonsus Feeder Fish

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      Sadly people who go off by the inch per gallon are usually people who just want fishes or lots of them and don't care about their actual well being. Of course in every pet hobby you have those people who don't mind keeping a hamster in one of those plastic cage, or a bird in those small barred cages, or a oscar in a 55 gallon tank.

      When it comes to stocking there is way more than just the size of the fish. One big part is the activity level of that fish. This is why harlequin rasboras require a 20 gallon tank rather than a 10 gallon tank, size wise a 10 gallon seems to fit but the 10 gallon is too small for them to be able to actually swim around.

      As for the max size of fish, let's just say for those bigger fish usually they do get big if you properly care for it. For goldfish, if you get a common goldfish, you can only have a 6 inch or only 10 inch goldfish, this will usually be due to stunted growth and not the proper nutrition. However if you keep them in a pond(how they should be kept) they tend to get to the 15+ size.

      This is what separates us aquarium hobbyist. There is a difference between those who truly care about the fish and wants it to thrive compared to those who just want fish to pleasure them. As they say, no fish is "hard to keep" if you fulfill the proper requirements of that fish you shouldn't have a problem.
       
    5. Alphonsus

      Alphonsus Feeder Fish

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      Also to add on about the measurements that people were using in the beginning, it's kind of nonsense. It's almost like a stereo type where you treat all fish as the same and thus categorize the minimum size tank by their body volume. Fishes are different from each other, if you have 2 6 inch fish, one is active and the other isn't they will both need different tank size. You might only need a 36" tank for the non active one while a 4 feet tank for the active one. Another thing to consider is also bioload. This is why for most plecos that stay under 6 inches it's recommended for a 20 gallon. Plecos produce big bioloads, thus if kept in a 10 gallon it will foul up the space more quickly.

      These factors are what makes stocking more complicated than simply measuring them. You have to understand the behavior of the fish also.
       
    6. Jeditaz

      Jeditaz Gambusia

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      10 years later and this post still enlightened me. Thanks Guppy! I never understood the rule until just now.
       
      Deadliestviper7 likes this.
    7. TUCCI

      TUCCI Gambusia

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      Well said and thanks for clarifying it.
       
    8. Davidiator

      Davidiator Piranha

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      So according to this I could have 750 glow light Tetras in my 150?
       
    9. ___James___

      ___James___ Exodon

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      Very well said. I agree.
       
    10. claytonyu

      claytonyu Feeder Fish

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      However this doesnt take into consideration the width and height of the fish
       

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