Thanks Billy, N8, Leigh, Dave, Keith, Dave, Ross, Jeff, Bruce,

The reason I posted the question was that a few days earlier green hair algae
started to develop on the leaves of my sword plants. At first I ignored it but a
few days later it was obvious an action needed to be taken.

It that time I only had some older Otto's. Algae developed even though the
Otto's were present in the aquarium. I went to Big Al's and got 4 young 1 inch
long SAE's. They helped extremely fast. 48 hours later about 50% of algae was
gone and 72 hours after SAE's were introduced to the aquarium about 90% of the
problem has been solved.

The only question now is: do we really need Otto's? Is there something they do
SAE's cannot do?

thanks,
Marvin