I kept various macro algae in my little tank because I like them. I found Caulerpa (various species) becoming a bit of a nuisance as it clings to the substrate, and has to be watched for "dissolving" (sexual propagation).
Also, it was said that Caulerpa can emit poisonous substances into the water. (Other people told me they never had any problem with Caulerpa apart from it growing all over the tank, so I did not seek further information about those "substances").
I now keep only Chaeto and a sort of red algae; neither cling/attach to substrate or rocks. The Chaeto grows rather fast, but can be removed easily if necessary (like Brian77, I stuck it behind a piece of rock to prevent it from floating around).
The red one looks rather beautiful, but grows very slowly.
I can confirm that from all algae I had, the Chaeto is most popular with pods and other small beings.
Kind regards
Annika