[BigFoot168]

So my RS an catfish seemed happy and heathy, and then all of a sudden the both turned up dead within a couple pf days of each other...I also have 5 Harlaquin Rasboras in the tank and they seem to be doing fine (so far)

I checked pH, temp, an Nitrates, which were all fine...any ideas?

 

[DevinWolfe]

Folks are really going to need your tank specs to help diagnose a problem.

Size - maybe too small?
Substrate - may have sharp edges and hurt the catfish, he stopped eating?
Ferts - maybe an OD?
CO2 - end tank dump? I'm pretty sure Rasboras have labyrinth organs, so they could have survived.
Fish - overcrowded? or is it JUST the rasboras?
Plants - plenty to keep toxins down?

A time table would likely help, what has changed recently?