I'd suggest less PO4.
No NH4, use KNO3 or Ca(NO3)2 instead.

All marine macro algae do well with higher NO3 than you can stand than with NH4.

You can still add a trace amount of NH4, but a few small damsels etc will do the same job and be better at all.

Iron is a big one.

I'll have the marine trace iron out here in 3-4 weeks.
For now, use DTPH based iron, Tropica is ideal and far better than other marine Kent and other junk they sell.

Regards,
Tom Barr