Aircrete blocks for caves

[jjdsplace]

Can Aircrete blocks be used to make caves in my tank

Aircrete is made from various materials including ground sand, PFA cement, lime, aluminium powder and water. They are blended together into a mixture which foams to create an exceptionally strong and light cementitous matrix with high thermal insulation.

 

[thumsa]

it sounds like a bad idea to me. Unless, maybe, you were to boil them for a while first. With my experiences with concrete, water gets into the pores and any chemicals in them would leak out. Lime would screw with your pH, doesn't it? I would think boiling, then letting them sit in a while, then boil them again would be enough to make anything in it go away, then you should be alright, just keep an eye on your pH

 

[jjdsplace]

thanks for that but i went with white cobbles insad and built up caves with them used tank silicone to secure them together