lightweight rocks

[keiferd]

I find my African cichlid tank to be a little more barren than it should be, yet I don't trust my tank stand or aquarium glass to hold any more heavy rocks. I also know that native African cichlid rocks are somewhat smooth and polished and tufa and coral rocks aren't recomended. Are there any lightweight rocks that are Ideal for a cichlid aquarium? If there are where can I find them? Thanx in advance.

[ibr3ak]

Not much different from tufa or coral, but do weigh alot less are feather rock and pumice.