the grey lava rock is not the native Hawaiian Lava Rock. There are other locations in the world that lava rock is available. Ive seen the type they are talking about. I got a rather large piece for free and I had someone at work cut it up. i thought if green algae likes the lava rock. Why wouldn't java ferns.
Anubis attaches well to tuffa, lava, and all sorts of other rocks. Before i moved, i had some very dramatic pieces attached to Texas holey rock. they were like submerged bonsai trees. with ferns, Ive only used tufa, but it worked fine.
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