One of my black corys has become rather lethargic relative to its four pals. It spends a lot of time sitting in one place on the substrate while the others zip about. However, it joins the feeding frenzy when I feed everyone and doesn't look distressed. Not breathing heavily and no unusual marks on it. Water parameters are all copacetic, and I did a big water change yesterday.
Should I be concerned or is this normal behaviour for this species? I've had false julii corys for a while now but these are relatively recent additions. Do I need to increase the black cory school or treat this guy with something or not worry about it?
Tank is 240L.
Should I be concerned or is this normal behaviour for this species? I've had false julii corys for a while now but these are relatively recent additions. Do I need to increase the black cory school or treat this guy with something or not worry about it?
Tank is 240L.