I’m going through the same thing with my tank .. I purchased a max 625 from Red Sea, 132 gallon during black Friday had it installed and over loaded it with fish .. about twenty five of them during a month’s time, without quarantine. During the past week a convict & a clown tang died suddenly, a blue throat trigger and a few others. & now i have a scopa, a naso, blue tang regal, a powder blue & a sailfin tang that have many spots on them. I’ve been feeding heavy about four times a day and they seem to all be eating well now, but I’m concerned about the water quality with so much feeding. I’ve been going to the LFS to get water test done, but they’ve been telling me that my nitrates are at 0. I find that very hard to believe with so many fish and deaths.
My other question is, would you recommend I keep the lighting on during the day? It’s a reef tank and it’s on an automatic schedule and the lights are extremely bright. Not sure if that will stress the fish out more. I already ordered the polyp lab treatment from Amazon. I’m waiting anxiously for it to arrive..