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Re : DIY rocks using concrete


Archer82
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Hi all, spent a while developing concerte rock for marine tanks. See pics. Used to make it to sell in shops for reefs and fish only tanks. I always used normal grit sand and building sand with no problems even with acros ect. I now work for a place that uses a type of plastic ( less weight ) to make 'rock' for public aquariums.

Shown, reef for a 4 foot deep tank, 66 inchs long

post-9-1120599759.jpg

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This one was made using 316 stainless and portland, grit sand and building sand. Ran if for about 4 years or so and had no real probs. I didnt use Posphate remover at the time and concluded there was no leaching from the cement. Would have to be pure portland thou as some have nasty chems in.

post-9-1120600215.jpg

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I used to use one from BLI ( Buxton lime industrys) UK. I know portland from castle cement would be ok. Not too sure what types you guys can get over there. If in doubt ring ( the companys ) tech line and find out if threre is anything added.

cheers jonathan :D

ps think they may have started to add feric sulphate now ( in the EU anyway ) but dont think this will cause probs once cured. Its only in very low % and is added to make the chromium 4 less soluable.

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