heavy rock in a tank.

[mitch.silk]

if it makes you feel better i had a cinder block in a 5 footer once

 

[cacichilds]

I'm sure it's heavy and awkward but it cannot be that bad. I would stand on a sturdy chair or set up two ladders and have two ppl lower it. All of my rock sit on at least an inch or two of sand. I'm a landscaper and I go to the quarry and get large chunks of Riverjack probably 20 to 30 pounds a piece myself. I actually sell rocks to my fish guy at the store so I can get fish at a better price.

Each of these rocks weighs at least 10 to 15 pounds.


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[Anchovie]

Since we are on the subject, has anyone ever tried using lightweight concrete to make your own rocks? It's lightweight because the sand is mixed with foam beads. It still sinks, it's just like 30% lighter.


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[F1 VET]

Since we are on the subject, has anyone ever tried using lightweight concrete to make your own rocks? It's lightweight because the sand is mixed with foam beads. It still sinks, it's just like 30% lighter.


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Concrete effects pH

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[Fat Homer]

Actually now that you mention it, a lot of rock types can effect PH value if there is enough in the tank...


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[TankDempsey]

b4 you mix the concrete i would make sure it doesn't have chemicals in it to aid in drying or otherwise... I saw a thread about this poor guy who bought concrete instead of sand and it instantly killed his bichir...

 

[majorhavok]

Again, I wouldn't risk it with glass. Most glass tanks are just a pane span supported by the outer frame. YES, the pane is designed to support the weight of the vertical water column with a comfortable safety factor. Unfortunately, that's only a few PSI tops.

Maybe someone can correct my math but if pressure is .43/.44psi per foot and most tanks on here are like 30" deep tops you are looking at a design requirement of 2psi tops. Most substrates are pretty light and in thin layers like sand and aquarium rocks. A 71 pound rock on the bottom, especially without something to distribute the weight over the whole pane is scary to me.