Well, actually this is very common. Your algae is using the nitrates and phosphates in order to grow so your water tests will show 0 (or close to it).
Do you have a fuge set up with macro? I honestly wouldn't plan on a tang in a 30 gal (JMO).
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Tom (The Tool Man)
"Give a man a fish and he'll eat for a day. Teach a man to KEEP fish and his family will soon be eating Ramen Noodles..."
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