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Get rid of all traces of Red algae (aka Black Brush algae) as soon as you see em. It is almost impossible to get rid of once it is established. If it is on an inanimate object, bleach overnight will do the trick. <It is pretty hardy in my experience, a quick bleach dip will not kill it all ... >.
Is it the red thread like stuff in the middle of Pic one? I have not see algae that shade of red before, but I suspect all red algae should be treated the same (as they are all the same genus) ... ie eradicate on sight... using 25% bleach if possible.