Help with Oto Cats

[VulcanNinja]

I got 2 Otos about a month ago to take care of some diatom algae as my tank was finishing its cycle. Now I have lots of green algae, but the oto cats aren't as active, and really don't bother with the longer green algae.

They will move when I put my net in the water, but they don't really move much anymore. Is this normal, or do you think there is something wrong? Water tests are fine.

 

[FishDan]

Hve you ever tried watching them after you turn your lights out? They are primarily nocturnal so should be much more active at night than during the day.

\Dan

 

[Oddball]

Another consideration is that the otocinclus is a shoaler so it may feel insecure and vulnerable without its "eyes" to watch out for predators