What kind of light do you have them under?
When I had mine under fluorescents they did really well. I now have them under 14,000K MH and they definitely don't grow as fast as they were.
Algae like it around 5,500K for best growth.
I have some red algae and it just kind of holds its own and will not root.
It is not dieing though just kind of holding its own.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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