One thing to beware of is that white rock like that is very susceptible to growing pest algae. Once the coraline covers it, you should have less problems but white rock like that seems to act like a magnet for hair algae and other nuisance species if your nutrient levels are allowed to rise.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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