Tested the water yesterday and it came out as PH -7.5 KH - 7 NO3 - 0 NH4 - 0 PO4 - 0. The tank is 150 Ltr and is fully planted with a bit of wood. I have black neon tetra, dwarf chain loach, rummy nose tetra, male fighter, spotted danios and flying fox and a GBA. Other people i know are having problems with some there fish also