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After so many hesitations and other stuff coming in between, I've finally managed to set up my first Opae ula tank. It's been cycling for a week now, so it's still to early to see any algae.

My question is, can I introduce macroalgae now (assuming I can get some, lol)? Or is it too soon? And if yes, how do I feed the algae? Is 1 single drop of freshwater plant fertilizer safe?

And if I the macroalgae looks fine after a week or two, can I add the shrimp then? Or should I wait a bit longer?