What foam to use

[Jinsen]

I saw most people use foam to create aquarium background. But im not sure if this is the right stuff. Epoxy wont do justice on my desire rock work


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[whatcaneyedo]

In addition to aquarium safe epoxy I have often seen people do a mix of aquarium sand and portland cement to mortar their rocks together. Afterwards the constructs need time to cure otherwise the cement will effect the alkalinity/pH in the tank. Or drill and dowel the pieces together with acrylic rod NOT ready rod which is metal and would rust. Plastic Zip Ties work too but degrade and fail in time.