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Setting up a new tank and considering using some lava rocks I found, they are quite sharp think they are called "loa rock". My concern is if the corydoras I am going to put in the tank could be at risk hurting themselves on the rocks? Going to have plenty of open space with sandy substrate but the rocks would look really good!

Hope this answers your Q

I think I get the gist of your answer, maybe a rather silly thing to worry about but I am overly cautious, sometimes(perhaps to a fault).