Pirate Ship

I'm afraid to put anything fake in my tank for fear of it leaching something, especially when you don't know where or how these things are made. Saltwater is a lot more sensitive to that stuff. Plus it will probably just get covered in coraline algae eventually anyway.
 
I would be ok with it getting covered in algea, because the rough shape is still there. What I may end up doing is carving my own pirate ship out of aerated concrete. Does anyone know how aerated concrete holds up in saltwater? Is it safe?
 
i think you would be better off with somthing plastic, ive build 3d backgrounds for freshwater systems useing concrete and i know they leach for a long time into the water and it also raise's the ph quite a bit. never tryed it with saltwater but i dont think it would be good
 
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