Is a 14 lb rock to much weight to add to tank? - The Planted Tank Forum
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post #1 of 23 (permalink) Old 01-22-2015, 05:17 PM Thread Starter
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Red face Is a 14 lb rock to much weight to add to tank?

I have a rock that I would like to add to my tank, but I am nervous of putting that much weight in one spot....am I being overly nervous or is this something that I should worry about? I am using natural rocks not fake ones so they have some weight to them, I just dont want it to bust the bottom...... this may be a stupid question and for that im sorry, but I just need some opinions
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post #2 of 23 (permalink) Old 01-22-2015, 05:53 PM
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As long as the glass is flat and well supported underneath, it shouldn't be a problem. Also, you're putting it on top of gravel, not just on bare glass, right? That will help distribute the weight more. Don't forget, glass is pretty strong... it holds a LOT of water weight, which weights way more than your rock. (8 lbs/gallon)


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post #3 of 23 (permalink) Old 01-22-2015, 06:06 PM Thread Starter
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Yes i have alot of gravel.... Not just ontop of glass Thanks for replying

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post #4 of 23 (permalink) Old 01-22-2015, 06:27 PM
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also keep in mind that a 14 lbs rock under water will weigh less once it is submerged.... if you can calculate the volume of the rock and subtract that specific volume in water weight ie the amount of water it displaces from the 14 lbs you will end up with your new weight...

14lbs rock displacing 1 gallon of water @ 8lbs a gallon would weigh 6 lbs
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post #5 of 23 (permalink) Old 01-22-2015, 07:06 PM
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Unless you broke that rock apart, 14lbs is 14lbs. Buoyancy is something different. If you plan on burrowing your rock in any way, use egg crate underneath the substrate. Placing egg crate on the bare glass will give you a 100% cushion against anything that may go that low. Egg crate is expensive but its worth it in the long run by preventing glass damage.

As mentioned above, don't underestimate the strength of glass. Although acrylic is actually stronger, glass can hold many many pounds. I remember seeing a youtube video a while back of a guy stacking many boulders inside of a 10lb tank. He stacked boulders 3'-4' high at 50lbs+ right in the center of the tank. A 10g is very thin glass and the tank never broke, he was just out of rocks and couldn't keep going.

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post #6 of 23 (permalink) Old 01-22-2015, 07:19 PM
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You're not the only one to have rocks in your tank. I wouldn't worry.

If the rock comes in contact with the glass, a piece of foam in between should do..
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post #7 of 23 (permalink) Old 01-22-2015, 08:02 PM
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It'll be fine.. I use rocks weighing 30-40 lbs in my tanks; just rest them on a softer mat or egg crate or something so there are no pressure points

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post #8 of 23 (permalink) Old 01-22-2015, 08:06 PM Thread Starter
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Thanks for all the replies you guys I put it in the tank and it looks great

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post #9 of 23 (permalink) Old 01-22-2015, 09:45 PM
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Do a check of African cichlid tanks where rocks are the norm. I Often have them stacked almost to the top. And don't worry about the bottom unless you are concerned about seeing scratchs from underneath!
When dealing with fish who dig you will find value in putting the rock directly on the bottom to keep them from undermining the stack so that it may tip and slide. And you for sure don't want eggcrate to be exposed every time they dig.
If it is a big rock and hard to handle, the biggest worry is dropping it so maybe a second set of hands is good.
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post #10 of 23 (permalink) Old 01-23-2015, 01:28 PM
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Quote:
Originally Posted by PlantedRich View Post
Do a check of African cichlid tanks where rocks are the norm. I Often have them stacked almost to the top. And don't worry about the bottom unless you are concerned about seeing scratchs from underneath!
When dealing with fish who dig you will find value in putting the rock directly on the bottom to keep them from undermining the stack so that it may tip and slide. And you for sure don't want eggcrate to be exposed every time they dig.
If it is a big rock and hard to handle, the biggest worry is dropping it so maybe a second set of hands is good.
PlantedRich that tank is beautiful. How many fish do you have in there?
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post #11 of 23 (permalink) Old 01-23-2015, 09:13 PM
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I like to stick things on the bottom, I'm a little concerned that they may be unstable resting on the surface of the substrate, especially if there is any settling, or if you have any critters that dig.

And I usually stick something on the bottom of the tank, not so much for weight distribution, but just to keep anything from scratching up the tanks. I think this is especially important in bigger tanks, as a lot of them have tempered glass bottoms, and if tempered glass is scratched deep enough, the whole piece will shatter and disintegrate.

Almost anything will work for this, but I like buying the really big pieces of plastic canvas (I think you can get sheets that are something like 12"x18" for a dollar or so)
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post #12 of 23 (permalink) Old 01-23-2015, 09:54 PM
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how many fish? Hard to say at any given time. It was a 75 that I used for both breeding and growout so the number varied a lot. When I took this picture there were three hap Moori (blue dolphin), maybe fifteen hap ahli (electric blue , the main group about a dozen yellow labs. The tank was set up mostly for the labs and ease of removing the rocks to catch the females when they were holding. The labs liked the rocks and were breeding till I was silly.



Heh, Buddy! When you gonna help me out here?
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post #13 of 23 (permalink) Old 01-23-2015, 10:00 PM
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Quote:
Originally Posted by Destinee View Post
I have a rock that I would like to add to my tank, but I am nervous of putting that much weight in one spot....am I being overly nervous or is this something that I should worry about? I am using natural rocks not fake ones so they have some weight to them, I just dont want it to bust the bottom...... this may be a stupid question and for that im sorry, but I just need some opinions

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post #14 of 23 (permalink) Old 01-24-2015, 04:46 AM
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Hey, how did you find that video, lol. I searched and searched for it. That was the one I was referring to. I didn't realize it was tempered but still, that is a lot of weight centered in a tank.

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post #15 of 23 (permalink) Old 01-24-2015, 11:06 AM
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Hey, how did you find that video, lol. I searched and searched for it. That was the one I was referring to. I didn't realize it was tempered but still, that is a lot of weight centered in a tank.
"how many rocks in tempered aquarium?"

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