Orange stuff on a rock in puffer tank?

[GuppyAdore]

There are 4 fig. 8 puffers in my 50 gallon (currently alone) and one of the rocks in my tank has this bright orange stuff on it. The rock is aqua safe because I bought it from lfs for aquariums. sorry the pic is so bad. Please move this topic as needed!


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[GuppyAdore]

Bumping


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[rockyofhockey]

Looks more like the rock kind broke up I'm not sure

 

[Delapool]

Can't tell either. Doesn't look like a fungus.

Maybe the rocks are volcanic and that is some sort of secondary vein (like quartz) which is either naturally coloured like that or has weathered (and gone orange due to high iron). Just a guess though but I'd assume safe. You could always put vinegar on it to check if carbonate.

 

[GuppyAdore]

Thanks so much! I'll be checking it with vinegar tonight. I really appreciate the replies!


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