Macro algae is sometimes a funny thing. There are some people that can't even keep cheato. I remember talking with another member here that was able to keep it successfully to export nutrients from their system and then one day had a couple of fish deaths and all of the cheato started dying off...ever since hasn't been able to keep cheato in the system. Never been able to figure out why. Even in my system, I haven't been able to keep cheato. Tried even caulpera, didn't do that well. Both have been removed, but have discovered tiny bits of both growing in hidden corners of the sump...just don't get much further than that.