You might try building the fish container out of PC then once finished coat the inside with several layers of Ferro Cement, go to http://ferrocement.com/aquaculture/aquaculture.en.html
--- In papercreters@yahoogroups.com, "danielramosmartin" <danielramosmartin@...> wrote:
>
> Hi everyone!
> I´m new in this papercrete technik, and I´ve seen you can almost build anything out of this thing.
> I wonder about the permeability of this material, and if there is an aditive you can introduce to the mix to do it waterproof, and at the same time to be safe for fish.
> Can anyone please tell me something about it?
> Thanks in advance!
>
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