help royal gramma

I noticed my fish swim against rock when the light comes on in the mornings do you know what could cause this behavior. Ive ruled out parasites because they act normal and look fine during the day they only act like this when the lights come on My ammonia is zero I use R/O for my salt mix...

Hi everyone, I’m new to marine and have recently set us my first saltwater aquarium. I have introduced 2 fire shrimp and earlier this week (Monday) a royal gramma. All water parameters seem to be ok with no ammonia, nitrate or nitrite present and the KH,Mg & Po in check. I noticed my gramma...