Picked up some nice holey limestone today from a nearby creek. But then I got to thinking that the limestone might harden the water for the Geos. What are your thoughts on this? The tank looks a bit bare at the moment and I think I needs a little something more.
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I'm not sure but I'd guess the limestone would affect the water chemistr, I wouldn't risk it myself unless I had African cichlids.
You could probably get more suitable rocks from a garden centre nice and cheap, that's what I do when starting a new setup. Or get more wood from that massive pile in the pic you posted. Look at the winner of the TOTM, that tank was just wood and geos and looked amazing.

