Just posting to give a quick update on the macro algaes (feel free to move this thread to tank owners if you with by the way Odin, possibly belongs in there really, I probably posted it in the wrong place. lol).
First up, the Caulerpa prolifera is a total fail. Died off/went sexual quite rapidly even before I moved it to brackish. Maybe one to try if you have a proper sized tank to acclimate it in. Even the rhizomes died, so no chance of a come back.
Next, the Caulerpa taxifolia is a partial success. Some died off/went sexual, however still lots looking nice and alive AND there's new growth appearing now. This one comes with a caveat though, it is HIGHLY invasive causing problems in ocean habitats worldwide. So be very careful what you do with it.
It's also toxic to many marine herbivores. http://www.rimeis.org/species/caulerpa.html
It's a very popular species in the aquarium hobby though BECAUSE it is so hardy and undemanding.
Last, but not least, the Chaetomorpha. I say not least, as this stuff has gone MAD in my tank!!! Serious growth, no die off at all, bonkers. Guess I fell lucky on the variety I received.
Next step for me is to manually remove the dead plant material. After this I'm going to experiment with how effective the bio-digest is at reducing nitrates etc, if not then I'll be doing a few partial water changes to bring these down. On the plus side, the release of nutrients from the prolifera is feeding algae growth. lol
Still fighting the temptation to add a small sponge filter to the tank...... Years of aquarium keeping (since I was 11 years old, I'm 42 now... lol) it's hard to move away from using filters.