Some Otos are weak from shipping and sometimes they die because of water conditions.
They also get stressed pretty easily and thats probably why yours was freaking out. Otos are schooling fish, so you'll need to get atleast 3-4 more to have the 4+ that they prefer. Really, I'd suggest having atleast 5, depending on your tank size. When you go back to get more, make sure you choose larger, fat Otos as opposed to the small skinny ones. The fatter ones are usually healthier.
Also, Otos like to have supplemental foods, meaning you can't just assume they'll eat algae. You should feed them algae wafers every day to every other day as well.
Have you checked for ammonia and nitrItes just to be sure they aren't in the water?
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 20g, 5.5g
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