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  1. #1

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    Default putting big rocks into a tank?


    0 Not allowed!
    i have a 75gal mbuna tank that i plan on re-doing in the warmer months. ive already collected some rock i want to use. the problem is that the 6 rocks in looking to use weigh close to 50lbs a piece. i know that in the past i had close to 130lbs of slate in the tank, and it help fine. im just wondering if anyone has a link to a sight, or knows how much weight a tank with a specific thickness of glass can hold?

    i will be using egg crate beneath these larger boulder type rocks for extra safety

  2. #2

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    Default


    0 Not allowed!
    My understanding is that any tank larger than 10 gallons has tempered glass on the bottom. However, if it were me, I wouldn't attempt using real rocks that heavy. Does your LFS sell realistic-looking fake rocks that are that size but are lightweight? That might be the safer route to go ... I just know I wouldn't do the other in any tank I have. I use real rocks at times, but they're much smaller and don't weigh that much.

    -- mermaidwannabe
    20 gal. high: planted; 5 white cloud minnows, 4 golden White Clouds, several RCS, 2 blue shrimp, 5 Amano shrimp, several snails; Azoo air. 65 gal: planted; 6 rosy barbs, 6 yellow glofish, 3 red glofish, 3 zebra danios, 5 white cloud minnows, 3 dojo loaches, 6 crimson spot rainbow fish, 12 large Amano Shrimp, several snails; AC110.

  3. #3

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    Default


    0 Not allowed!
    yea my tank is a tempered bottom. i dont like using fake rocks, especially when i can find mine for free, instead of paying 15-40 bucks a piece. im thinking about drilling and cracking them and spacing them out so the weight is more distributed instead of concentrated on one side of the tank.

    edit: ive been doing a lot of reading. the info in finding pertains to SW but weight is weight no matter what the water. one post i read on a website is from a guy who has ~230 lbs of sand and rock. time to keep reading!
    Last edited by KatzeSlaugen; 02-19-2011 at 06:29 PM.

  4. #4

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    Default


    0 Not allowed!
    sorry for the double post, couldnt edit in time.
    found this cool youtube video about a 10gal holding weight. also found a lot of people saying that tempered glass proportionate to the tank can easily hold the weight of the water +400lbs of "extra". since ive got about 70lbs of gravel it means ive got a little over 300bs of wiggle room. no way im going to be putting that much in, to nerve racking for me

  5. #5

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    Default


    0 Not allowed!
    Everything is lighter in water. ;) Volume is what the tank is designed for and water weighs 8 pounds a gallon.
    Warning; Bulldog Pleco guarding my Sons tank now..

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  6. #6

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    Default


    0 Not allowed!
    well i guess to get technical im not worried about weight, im worried about the mass of the rocks. everything is "lighter" in water relatively, but everything has the same mass in water.

  7. #7

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    Default


    0 Not allowed!
    The mass isnt what will break your tank! Am I mistaken or for something to be lighter in water,then it must be buoyant?

  8. #8

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    Default


    0 Not allowed!
    Quote Originally Posted by smaug
    The mass isnt what will break your tank! Am I mistaken or for something to be lighter in water,then it must be buoyant?
    That would be lighter than water.

    Also the ratio of surface area to mass plays a role.


    Anyway, you will be fine with the rocks, especially with using egg crate to disperse the weight.

    Liters to Gallons conversion calculator

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    your argument is invalid." ~Mommy1


  9. #9

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    Default


    0 Not allowed!
    Quote Originally Posted by KingFisher
    That would be lighter than water.

    Also the ratio of surface area to mass plays a role.


    Anyway, you will be fine with the rocks, especially with using egg crate to disperse the weight.
    Than bite me KF

  10. #10

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    Default


    0 Not allowed!
    haha yea i worded that kindof wrong. but yes it must be buoyant to be lighter. seeing as water is 1 in density and most terrestrial rock is around 2.5 if i have a rock that displaces one gallon of water in volume will itself will weigh 20lbs

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