I just got 2 bolivian rams from a reputable dealer and now they are swimming up and down the tank walls for hours. If anyone has any experience with this I am really just curious.
I disagree that it is related to some kind of medical issue. Normally fish that are affected by flukes etc will flick themselves against a hard surface or the substrate. Just swimming up and down the glass is like Dr Rob suggests. Just fishy curiousity My Corys are always playing with their own reflections.
I've had fish do this on occasion. I find it slightly annoying. I imagine they are not happy with the tank, bored, going crazy and want to end it all and jump out or something.