I don't personally feed amino acids since all the proteins we input cover the spectrum perfectly
They're used in color tuning sps systems i read, but mainly redundant in a normal setting
When humans intake more than the required amino acids they store them as excess glycogen in muscle mass, it's not helping anabolism to be redundant these biosystems get what they need off complete feeds. I bet there's a breakpoint in reef physiology where no more aminos are uptaken vs what's needed and the rest goes to fuel algae as breakdown ammonia eventually, nitrogen
Reef roids very good feed