Sorry Henry Hill, I know your pain. I'm not going to tell you what you should and should not buy. Only because I tried everything stock wise(snails, crabs, fish,) to rid my 8g of HA. I found that if the HA is to long nothing would touch it.
I fought for better then 6+months. I lost a lot of
zoa's, from being choked out. Even those in the SB on their own plugs. Finally I quit buying any. I started researching what *algae* really is and how and what it needs to grow.
The algae was there from the beginning. In the
LR. The
LR is leaching nutrients in the way of die off. Of course light, water source, feeding all played a part but still. I couldn't do anything but find something to out-compete it. But until then what about the stuff that's already taken over my tank. How do I get *RID* of that. I didn't just wanna keep it from growing ya know.
This is what I finally did. While still picking as much as I could, on a daily bases no doubt.
I bought some, Marin-Chem Stop Hair Algae. It worked wonderfully! I applied it to the worse and largest areas. Making sure to stop any and all flow during application. Allowing it to sit for about 20-30 min before returning flow. Within 48hrs the treated spots were clean. No harm to my corals at all. Except for the
zoa's I applied the stuff to directly

still the loss was worth the results.
What I liked about the stuff? Is it smells like black Licorices!! YUM! Oops sorry I love black licorices.
I have no more HA in my tank at all. Haven't even had a re-occurrence. I'm not trying to sell you on anything, just sharing what worked for me with the Long Hair Algae.
http://www.marinedepot.com/Chem_Mari...FIMERM-vi.html