rocks

[LeaninLowLa]

I recently picked up some rocks that i figured would look great in my new 75g tank. Upon cleaning them i noticed what appeared to be rust?? I know the picture quality isn't great, but how do the rocks look in the pictures? The one in my hand is the type of rock that had rust. Would theses rock work in my south american cichlid tank?

 

[blood1795]

are those rocks out of like a bag you can get at home depot or something

 

[blood1795]

sorry didnt read you picked them up we used the same type of rocks on my friends 75 gallon oscar tank just make sure you wash them really good we thought we did dirt still came off