scape

Ok so I my geophagus alitfrons are due in on Wednesday. They are going in my 125 with the arowana. So the question is how can I make them feel at home via aqua scaping I currently have Pfs substrate with some smooth river rocks and one larger center piece rock... So what should I add? Some...

Have some, read that you should boil it first to leach impurities and I suppose perhaps as a way to test solubility/integrity. It's generally lacking sharp edges (though such could be easily removed), just wondering if anyone has ever used it and whether it had any significant effect on your...