I'm thinking about how to set up a cichlid tank, and how to give lots of hiding spots affordably. I was thinking about checking out Lowe's and Home Depot for broken paver stones (like this http://www.lowes.com/pd_19193-215-104804201_4294728526__?productId=3018998&Ns=p_product_price|0) and trying to get them marked down, since they are broken. I figure I can stack them up in such a way that they will allow lots of hiding spaces, and also would add in some terra cotta pots. Is there any reason this would be a bad idea? Are stones like that treated with anything that would be bad for the fish?