tank is 55gal, using Rena Xp2, angels, discus, cory, bristlenose.
tank has been up for at least 6 months now and no recent changes. (well i downsized from 150gal about 3 mths ago but i used the saame water)
ph is around 6-6.4 ammonia is 0-0.25, nitrite is 0 and nitrate is 40-80
I dont see any white spots.