...not at Petco but at a highly reputable LFS in San Diego that a small Tang would help increase my bio load as there were low nutrients, I called the owner of highly reputable LSS store number two in San Diego, and he concurred that a small tang in my size tank would be fine...
Just curious, which two LFS was this? I've been to all saltwater LFS in San Diego and based on my conversations with the employees, I trust none of them.
Most of them have a single system with all tanks sharing the same water. Some of the fish in tanks have visible ick, which is a clear sign to not purchase ANY fish in other tanks either. I'd only buy corals from Aqua SD, but I've avoided fish and inverts from everywhere in SD.