Glad to see you're doing your research. In my tank I used 25 lbs live rock and 40 lbs base rock (40g Breeder BTW). If i didn't know which one's came from the store I wouldn't have been able to tell the difference after about 4-5 months to be honest with you. This is common and the benefit of base rock is that you know what's going in your tank... no hitchhikers, even though they can be pretty sweet sometimes. Yellow tang should wait until you upgrade, because let's face it.. if you catch the bug you will want to upgrade.
Cheers,
Evan.
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