Lava rock wouldn't be my first choice as a saltwater decor. Not only are those things dangerous to your tank (being lava rock you never quite know what elements are in them)... but their surfaces are usually algae magnets.
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210 Gal Reef w/ 55 Gallon Sump/Fuge, 125 Gal Fish Only, 65 Gal Seahorse-29 Gallon Sump, 55 Gal FOWLR, 54 Gal Corner FW Community, 20 Gal Nano FOWLR, 55 Gal Piranha, 29 gallon QT
"All the yellow tangs and clownfish in the world can't save you now! hahahah" Peter from Family Guy
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