Dead Clown Loach

[Avinitlarge]

Its a bit late to be an emergency but Someone may beable to shed some light on the problem

Thursday morning I checked my fish when I woke up, No problems
Thursday Evening I got in from work, All 3 of my clown loach had died, Everything else was and is fine.

Why would this happen??

 

[WILDER]

Size of tank in gallons or litres.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.
Clown loaches are prone to whitespot and skinny desease.
Were any of the clown loaches thin.

 

[Spooky76]

As wilder said, clowns are prone to desease, as I found out early doors, they do like things spot on. Had you done anything ? Changed filter or water change or added new fish or something ?
If they all died at once its got to be something in the water. Do you check your water with a test kit ?