Red Sea Trace Color C and D

[Spare time]

D contains Silver, Gold, Vandium and Tungsten, which red sea says is used in the production of blue/purple chromoproteins (pociliporin , diadinoxanthin and dinoxanthin). I am curious as to whether anyone else thinks that this bottle is completely unnecessary. Their Trace color C has Iron and Manganese which I know to have uses but also has a bunch of other metals that seem rather silly (specifically aluminum and chrome; others I know how they work in some organisms). I ran out of my small trace color bottles and only replaced A and B and then bought chaeto gro as my replacement for C.

Thoughts?

 

[GoVols]

Color D contains 18 different trace elements out of Red Sea's 31.

Going to get different answers, but I'll continue to dose-D