i just got three Otocinclus catfish in my 29 gallon planted aquarium and they are very energetic. they swim around alot, and they are forever stuck to the side of the glass.
but alot of the time, they are just swimming in vertical circles with their nose stuck to the glass. I would have to say the circle is approximately 4 inches in diameter they swim in. and sometimes its just one of them swimming that way, and sometimes there are two in the circle.
Is this normal??? they dont seem to be unhealthy...
If they arent swimming like that, they are eating!! LOL
Thanks for any help!!