Manual Removal - if it's not there, it_Can't_ grow... right?

Wrong. Red algae is designed to survive in fast moving stream water by
nailing itself to rocks, wood, and plants. This stuff is related to
coraline in the sea. Ever tried pulling barnacles off rocks at the coast?
Not easy and certainly not fun. Epoxy cement has real competition here.

It is extremely tough just trying to scrape BBA off plastic tubes, virtually
impossible to get it off of wood, and IS impossible to get it off other
plants without ripping them to shreds!

Going through all that work and nightmare may make it less visible for a
short time, but you have done absolutely nothing to remove it from the
system. There are spores in the water, there are fragments still remaining
on all of the surfaces. You will never get rid of it mechanically. It will
just keep coming back. Physical removal is a total waste of time and
effort unless you have chemically killed it first.

I'm convinced that sterilization by Chlorine or equiv. is the only way to be
rid of this stuff. Perhaps the AZOO Brush Algae Killer does the trick. It
appears that no one in the USA or Canada has this stuff yet. I'm still
looking for it.

It should be noted, as NEMO said in the previous post, even after you kill
this stuff it still does not decay away. The threads are still there, dead
and bleached out white. Now ask yourself, if this stuff was anything like
Green algae, why doesn't it just fad away as soon as you kill it? Because
Red Algae is very different. The threads are made of very tough fiberous
material - its freshwater seaweed.

Chris.