Yes, I will, it'll be specific to pH's above 8.0, at first for the hobby it would seem.

I'm undecided as of yet as to the ratios and which metals may be added other than Fe and Mn.

I may just do one simple version, as many of the other metals are seldom limiting.
The scope of marine macro algae is extremely wide and making a one size fits all version may be tougher than we think.

Yes, it'll be available through a distributor in the UK.

Regards,
Tom Barr