Corydoras Changing Behavior
I've had these 6 corydoras for at least a month, they root around in the sand all day usually.
A few days ago I made two changes. I changed the direction of the flow from the two TopFin 20 submersible filters, and I added two Golden wonder Killifish (striped panchax). The reason I changed the flow was to avoid having strong current at the top where the new fish would live.
Since then, the cories all just sit on top of a big rock most of the day. The killifish like the bottom feeder pellets I drop in for the corydoras. But if they were afraid of the killifish, I don't think they would sit on top of a rock, making them more exposed. Is it possible the killifish scared them away from eating their pellets? Or more likely the changed flow has made it hard for them to be down on the sand? or something else?