My Otoxinclus behave strange

[Terrible]

Recently since 2 days ago my oto seems to disappear and gone into hiding.
Use to see 4-5 out of my 6 Oto but for past days i can only see one..
Any clues as to why the strange behavior?
I just drop my tank temperature from 25 to 24..
Are they affected? Too cold?
I read up some spec that Oto are ok with 24.
My tetra , fire red shrimps, SAE and Cory seems to do fine thiugh.

[Terrible]

Today one Oto appeared.
The other 5 still missing.

[kklim]

Could also be on underside of plant leaves or in the filter.

[genki89]

Lol soon your shrimp will disappear. SAE will grow big


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