So i came home this afternoon from work to find my entire colony of leopard fish dead - a couple still wriggling - but all have ultimately died.
Now im no stranger to death when it comes to fish it can sometime be a bit of a numbers game and when you have ALOT of fish you tend to see it a little more frequently as the generations come through but not usually in these numbers.
So this tank is a well cultured tank - its housed wcmm and leopards for about four months now of various sizes - but previously housed guppys for 9 months - mostly well grown fish. its a 300l and had about 100 leopards mostly well grown adults and 20 or so wcmm. Its gets water changes twice a week and i feed live food - has alot of moss and a thick layer of riccia and brazilian pennywort.
Its strange because all of the wcmm are uneffected but not a single leopard remains standing, also strange because this morning at 7am (as i run my fishroom backwards to my daytime) when i put them to bed, everything was good! infact i had noticed a few day old fry. Some of these girls id had for 4 years or so, so were probably on their way out anyways - but another weird thing is about 50% of the lush green riccia that usually floats on the surface had turned brown grey and kinda slimy. This is only about 7 hours after id left them this morning.
Ive pulled it all out and done a 90% water change, taken all the dead bodies out and left the wcmm as they seem fine but im wondering if anyone could figure out what may have occurred? foul play? I've not ever really had a mass extinction event accept when i was 13 with my first tropical fish tank and boiled it because there were no thermometers on those heaters then.
Let me know if you've got some idea's
Cheers