No, use TMG, it's the best source at the moment.
I will have some other marine specific traces coming up, ETDA and Gluconate are fine if the alk is low and the pH is like, 6.3 or less.

But at high Alk and high pH?

No, the chelators are terrible.
I have a chelator that is excellent above a pH of 8 for Fe and other trace metals.

It'll be fairly quick for this one, I've been working mainly with the FW version.
I have no idea why Kent and other companies sell the ETDA(well, this one is dirt cheap) and the Gluconate traces for marine systems, they are the worst possible chelators.

Regards,
Tom Barr