Hello, I have been given the task of looking after my son's tropical fish, which I've been doing for the past 3 months without any problems. Now suddenly 2 have died this week, a red tailed shark and a albino shark. They both had wedged themselves between (1) a jar that had a baby plecostomus and (2) the thermostat. Prior to their dying they have both been swiming sideways or lying in their hollow plastic log upside down!
Being new to this, it didn't occur to me that there just might be something wrong. Can anyone throw any light on what is going wrong, please.
Many thanks
Carol