Chaeto not growin

[IanWR]

I assume that even simple plants like chaeto still need a supply of nitrate and phosphate to grow. If one ran GFO, had a lot of good mature liverock, didn't feed heavily, etc I imagine you could end up in a situation where the plants were starved. Maybe they stopped growing because your phosphates and nitrates were very low? If thats the case, then yahoo! mission accomplished.