Maximum weight for Driftwood for 75 gallon tank

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Rays of Sunshine

Feeder Fish
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Mar 20, 2010
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Georgia
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I found some interesting pieces of driftwood lately. The first one is huge, takes up one half of the tank and two branches sit above the tank by 3 inches for the small branch and the longer one is 5 inches(about 30 lbs. and wide) The second is an old piece attached to slate(maybe 5lbs.) The third piece is long and about 8 inches wide(about 15lbs.) looks like log. I also have a couple of small to medium pieces too.I will take a rough picture of it. I am still working on the design of the tank. I am trying to create a balance of the actual habitat and enough territory breaks for the fish. Is this too much weight for the glass tank? The tank sits directly on concrete floor.
 
When you consider the water the wood displaces, the actual weight increase in the tank will be less, but either way it isn't significant. Assuming the wood actually sinks, of course. If it floats then obviously it isn't increasing the weight at all. The water in the tank alone weighs around 600 pounds; you could probably do jumping jacks inside it and not have a problem.
 
FSM;4167520; said:
When you consider the water the wood displaces, the actual weight increase in the tank will be less, but either way it isn't significant. Assuming the wood actually sinks, of course. If it floats then obviously it isn't increasing the weight at all. The water in the tank alone weighs around 600 pounds; you could probably do jumping jacks inside it and not have a problem.
I thought all items placed in water displaced their equivelent water weight, and so the overall content weight (wood, water, substrate) would be the same as just straight water weight.
 
It depends on the density. A 5 lb rock displaces less water than a 5 lb piece of driftwood and therefore adds a bit more to the total weight.
 
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