03-04-2011, 08:54 AM
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Otocinclus are rather sensitive fish. In my experience, they tend to find food when they are hungry, and if the algae is depleted they quickly learn to eat sinking foods. Lethargy may be due to water issues and lonesomeness as zof said.
The water issue is obvious, from the "slime" which is cyanobacteria, the snails increasing, and the neglect. I understand situations arise for each of us, but a fish tank cannot be ignored for a month without trouble. A very large tank biologically stable can go for several weeks without food, but water quality is going to diminish quickly unless the fish stocking is very, very light.
Otos will only eat common green algae and diatoms (brown algae). They won't touch the many other types, or cyanobacteria which is strictly speaking not an algae but a bacteria (the green slime). This is due to organics (maintenance again, and overfeeding) in the presence of light. Getting the tank back in shape should clear this up. But the oto may be gone, depending upon what toll all this has taken.