Don't put any of your buddy's rock into the tank. I made the terrible mistake of doing someone I barely knew a favour several years ago and stored some LR for him. He didn't tell me it was covered with aiptasia and hair algae and I didn't put the rock away until he left. At the time, all my tanks were sumpless so the crap rock went into my display and just ruined my good rock.
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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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