Hi,I just started keeping saltwater, this is my first tank and first fish, I made the mistake of not quarintining because I assumed since she was going to be my only there would be no issue. The tank was already cycled for 2 months before I got her online. And since then I've had no issue for 5 months. The tank is stable and my parameters are normal! I missed a water change one day. I do 10% once every 7 days, but did 15% next day since this is a nano 14g I dont do too large. The only other thing in here are snails and macros, the tank itself is healthy but this happened overnight? What can I use to fix this and do you have any idea what it is? I think brooklynella or velvet bc Ive seen velvet and ich on my freshwater tanks. will i have to take down the whole tank?



