Milkshake, quite a few people [self included] don't feed out fish/coral vitamins/AA's and don't feel that they suffer a bit.
Some feel they see great benefits to dosing them and do.
It'll depend on who you ask, I guess. I personally prefer to feed a diverse food [like Eric's coral chow] to my fish/tank and feel that with such food - additional nutrient is unnecessary.
If only my corals would tell me ...