I have hadthe same size "ball" of Macro Algae for the while now. It has not grown much from when i first got it. The first month i saw some growth but after that, its just remained the same size. It looks healthy and all, just isnt growing. What i have now is not enough to be much use as filtration. Its too small to filter an 80 gallon tank w/sump and i would really like to have more of this stuff which was kind of hard for me to find.\n\nI have it under 30 watts of light. Is there a reason for why it stopped growing? Is there anything i can do to make it grow faster? They thrive on excess nutrition more so than light - is that correct? Or should i increase my light?\n\nThanks in advance!