concrete backer board

[msman825]

anyone know if this stuff is reef safe

 

[msman825]

nope it ant reef safe http://www.usg.com/USG_Marketing_Co...nts/MSDS/Drck_CementBoard-MSDS_14-090-001.pdf ENVIRONMENTAL TOXICITY: Portland cement is expected to be toxic to fish due to its high alkalinity (pH > 12).
Discharge of large quantities directly into waterways would be expected to cause significant fish kills.

 

[Spawn]

I was also looking at using this stuff for my pond and wondered if it would be toxic to my fish. is there a concrete backer board alternative that I could use in my pond setup.