my tank is 120litres I have 3 neon rainbow, 6 neon tetra, 2 dwarf gouramis and 2 blue rams.
water stats
ammonia 0ppm
nirtate 0ppm
nitite 0ppm
ph 7.2
just noticed my female ram is turning blackish (all over) in colour the male ram and other fish are ok. Is this serious and can I do anything for...