I have brown algae in my tank, so from reading entries in this forum I decided to go to my LFS to get some Otos. The girl in the shop didn't know what they were, and they hadn't got any anyway, but said that brown algae was toxic to fish and i should leave the aquarium light off for a few days. Knowing the reputation of the knowledge of LFS employees, I presume she's talking rot - but can someone confirm this please?