I ran a macro algae tank for 5 years. Great tank. Super fun.
Here is what I learned. It is almost impossible to get enough water movement once the thing takes off. My tank below turned over 135 times. You wouldn't know it by watching it. I ended up putting spray bars under and through the rocks to stop detritus from building up, that really worked.
They need a ton of food, and also good filtration. I was carbon dosing. Seems weird to say both, but macro needs available nutrients to grow, but also bad algae grows faster. Having a limiting nutrient, it was phosphate for me was helpful for a balance.
Many macros grow slow, some grow fast. Keep one fast grower as kind of a safe guard, so your others can grow. I used fern as my fast grower and would pruin it a few times a week.
Pick your snails and hermits carefully so they won't eat your display pieces.
Some species do need good stable alk like halmedia.
Go for a balance of color and textures. All greens blend in, you have to mix them up a bit for them to pop.
Macro's pair well with LPS because you can drop 5 cubes a day in a 40g and be fine.
HTH
Reach out if you have any other ideas/questions
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