Is sakcrete concrete dye safe for aquariums?
im making a 3d background for my tank and its the only concrete dye i could find. is it safe for fish?
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Try calling the manufature they may know or atleast be able to tell you if it has harmful chemicals.
You might could also see if your local aquarium may know (Like Shedd Aquarium in Chicago) as they probably do some weird things to make their stuff cool.
Please let us know what you find out by adding more details i would be interested to know.