am i being a Sissy

[Basile]

Originally Posted by Proteus

That's sweet

Consider drilling holes and using acrylic rod to hold together

I dont know if your joking but if you look at the picture thats exactly what i did actually nylon rods with nuts and further more its all cemented , the last one will have a stalactite comming down.

[SoloSK71]

As long as the bottom glass of your tank is supported on plywood or similar you will be fine with that structure.

Charles

[Proteus]

I'm on iPhone so pics small. I though the support was a PVC piece.
Would be better if it were hidden though

[Basile]

Originally Posted by Proteus

I'm on iPhone so pics small. I though the support was a PVC piece.
Would be better if it were hidden though

It will be hidden under 2 " of sand and the support right under the rock will be foamed and then sanded with resin epoxy. Nothing will show.

[sphelps]

The rock will obviously weight a lot less in water, the weight of the water displaced can be subtracted from the rock weight to get the apparent. The density of rock varies but it's often not much heavier than the water itself. Actually recently seen a piece of rock float in a tank So basically don't be concerned about the weight of your structure on the glass, it's also much stronger than the plastic PVC frame you built.

The structure you made looks awesome btw.

[Basile]

Originally Posted by sphelps

The rock will obviously weight a lot less in water, the weight of the water displaced can be subtracted from the rock weight to get the apparent. The density of rock varies but it's often not much heavier than the water itself. Actually recently seen a piece of rock float in a tank So basically don't be concerned about the weight of your structure on the glass, it's also much stronger than the plastic PVC frame you built.

The structure you made looks awesome btw.

Thanks, i've got other sculptures on my thread , take a look; http://www.canreef.com/vbulletin/showthread.php?t=98466

[WarDog]

Basile, I too am planning a custom rock sculpture in my build. I would suggest removing your pvc base and replacing it with 4 or 5 rock feet. I was planning to use all rock with a nylon or pvc skeleton as you have done.

[Basile]

Originally Posted by WarDog

Basile, I too am planning a custom rock sculpture in my build. I would suggest removing your pvc base and replacing it with 4 or 5 rock feet. I was planning to use all rock with a nylon or pvc skeleton as you have done.

Their's only one problem it doesn't solve the focused weight problem, the 60lb will be focused on these two rocks foot print. No , i've just got an idea, Lowes has pre-cut plexiglass that i can buy. Then i'll rebuild another support system with 1" pvc this time and still put eveything on a plexiglass who'll spread the total weight along its entire area of the panel and protecting the glass at the same time. Thanks for your inputs guys.

[eli@fijireefrock.com]

[quote=Basile;No , i've just got an idea, Lowes has pre-cut plexiglass that i can buy. Then i'll rebuild another support system with 1" pvc this time and still put eveything on a plexiglass who'll spread the total weight along its entire area of the panel and protecting the glass at the same time. Thanks for your inputs guys.[/QUOTE]

I would buy the thickest plexiglass available to have a safe piece of mind.
Make sure all your PVC on the bottom is as straight a possible simply to disperse the weight equally...
I like your design..

[ScubaSteve]

Originally Posted by Basile

I dont know if your joking but if you look at the picture thats exactly what i did actually nylon rods with nuts and further more its all cemented , the last one will have a stalactite comming down.

If you are using nylon rod, switch to acrylic and it will fix most of your problems. Nylon is not the best choice as it will begin to crack under the weight and will soften and swell in water.

Also, you can use physics to your advantage and add some weight on the opposite side from the overhang to reduce the torque (the bending force) on the rods. I did this on one of my old tanks and it worked like a charm. There are a few other things, like anchoring rods, that would also fix this and be easily hidden.