Hi I have had a community tank running for around 5 years and although the water parameters remain stable ph around 7.2 -ammonia 0 (very pale yellow )nitrite 0 (pale blue ) Nitrate 0 (yellow ). Temp sits around 25. This year I have kept losing fish recently its been bristlenoses but I have lost lots over the last year no of them appeared distressed just the next day /night I found the odd one dead ... . at the time of finding dead fish I have checked the water and the readings have all been good. There are no signs of red gills,gasping prior death.The fish look normal just DEAD!! The tank is 360L running an Eheim 2217 lots of air stones, several plants. I set up the tank with Daltons aquatic mix... and very fine black grit on the top. Feeding every 2 days with flakes pleco wafers etc and the very occasional blood worm .
Inhabitants are 30 neon's, 6 cardinals, 5 bristlenose , 3 yoyo loaches , 1 gourami ,6 catfish ,3 synodontis. plus a few odds and ends WC s around 25% weekly and i add prime .I am wondering if I need to strip down the tank and replace/remove the Daltons , would that be causing any problems?
Any suggestions
Thanks Gill