This is so true about the Caulerpa. C. Prolifera was the least in the commonly kept varieties, troublesome one. It is easy to pull out from unwanted spaces.
Very interested in watching what your set up will be. My 80G is yet to be set up but I wanted a corner with some grasses.
Are you using any mud? In some suggestions I read was using mud and I think a tray of mud might be good to grow the grasses in, but still not sure how to actually pull it off without the chance of the mud messing up the water (all the time, occasionally???)
One of my favorite things is the plants in the SW
. Long term I haven't been successful with the Pencil, Shaving Brush or Mermaid fans, purchased them 2x in 5 years. Worth the effort, and so cool looking.
My best one has been Black Codium /Codium Fragile (have also seen similar ones called Green Codium) aka Dead mans fingers. Apparently like many things which can grow well in a tank, is an invasive pest in many sea waters. I love it in my tank though, definitely gives a ocean environment look.
So my warning thoughts would be that just in case you end up with an infestation of Caulerpa, or it melts on you and causes a tank crash, be thinking that the whole mess of rocks and sand and things in the tank are possibly contaminated with the offending Caulerpa. And you might need to scrap them if there are any serious problems.
Although I do not worry about it presently, just have a couple feathers of the one type and I don't actually recall seeing the Prolifera around for a few months.
I think that they just need routine change of water and not perfect but reasonable consistency in parameters. I had melt downs after large amounts of water added for refill of evaporated water, as in waited too long and did a too large RO
And also after not changing the tank water frequently enough I think. And having the water too warm.
The recent 2 places which had some interesting variety was Reefcleaners.org and Algaebarn (which seemed a little more expensive) Had more variety than RC. All places seem to get more kinds of things and run out frequently with changing varieties and availability.
AB has some cool things right now.
This one looks very interesting - if you read the info it says it "forms a dense mat in long shallow refugia" quoted from their description.
FAST GROWING - CRUNCHY MACRO"
If I had a big budget I would try all of them again.
Wanted to try this one from RC
Carpeting Halimeda (Halimeda Opuntia) RC often has the Mermaid fans, shaving brushes and pencils, they look great in the tank, come in healthy..