I've been pulling out large amounts of a red, branching, very fine hair algae that appears to have no grazer within my aquarium and is smothering all my other algaes. I've been unable to identify it. When it 1st appeared a month or so ago I thought it was rather attractive, but it has now become a pest!
Macroalgae growth has been pretty good, with Oyster Thief (Colpomenia peregrina) growing up to 7" across and having to be removed, further smaller specimens are being allowed to grow.
Dictyota has sprouted in a couple of places, but suffers from red algal smothering.
Wrack growth is very slow - probably due to mineral defficiency. Cystoseira remains healthy with many attractive bright turquoise shoots.
A probable Calliblepharis has propagated on the glass, an attractive red macroalgae that unfortunately chose to grow next to one of the powerheads.
Coralline algaes suffer from smothering by the red hair algae, but where exposed to light remain healthy.
It is possible that lowering the temperature will have an effect on the red algae, but its my belief that the light levels are too low for the green algaes to out-compete it.