also took water to fish shop who tested it and said the same, no ammonia, no chlorine
tank has been established for months, live plants, no issues whatsoever
monday 15th - came home from work, 2 out of 7 of our tiger barb were dead, 2 out of 6 glowlight tetra dead, panda & peppered cory and red tailed shark absolutely fine
tested water, everything normal, nitrates slightly high, maybe 15ppm so I did a 30% water change, retested and they were down to 5ppm
fish continued to die over the next few days, gasping at the surface for air, gills red in some of them, but still the tank tested fine, some looked like they had a swim bladder problem
our last remaining tiger barb started growing a fungus on it, i treated the tank with lovefish bacteria & fungus treatment on thursday, fish died on friday
as the tank tested normally and everything looked fine we bought some neon tetra on friday hoping that if it was disease that killed the fish it was eradicated by thursday's treatment - they were all dead this morning
currently have 1 remaining panda cory in the tank, and a peppered cory which looks like it's dying - very lethargic, some yellow rabbit snails and some amano shrimp
question now is what do we do? obviously won't introduce any more fish but we have no idea what the problem is so don't know how to fix it. Any ideas greatly appreciated
Is your water hard or soft? Have you noticed the RTBS chasing other fish at all? Is there anything that's been used nearby that could be causing a problem by getting into the water - furniture polish, air fresheners, plug-ins, scented candles etc?
hard water, RTBS was extremely well behaved as he had a little cave of his own but he wasn't an adult when he died, only about 3 inches. could be environmental as we do have scented candles in the room although not close to the tank, any way we can test for that or is it literally a case of starting again and being extremely careful? thanks!