As of yesterday our left side of my tanks corals haven't been doing too well. Our Torches, Hammers, Frogspawns and Duncans below are all struggling, I had to remove one Torch this morning because one of the heads started to show the white as the head looked like it was dying. All of these corals have been in the tank for a month or 2 now. Meanwhile everything else in the tank, including my Cynarina which is on the left middle and the Wellso which is dead center of the tank are doing fine. We check our parameters daily and there hasn't been any change in Nitrates, Phosphates, Calcium, Magnesium or Alkalinity. Salinity has maintained between 1.024 and 1.025.
Anyone have any ideas on what could be causing this or recommendations to check?
Recent Events for background:
- On 6/7 we did a 10 gallon water change on the 62 gallon tank and siphoned the sand
- On 6/8 we added a Spotted Mandarin to the tank
- Evening of 6/8 to 6/9 forgot to turn the return pump back on the left side but there was still continuous flow from the Reefwave and other side pump. This return pump had been off for roughly 8 hours. (this is what I currently suspect to be the cause).
- On 6/9 we took the Dragon Soul out to clean bubble algae off it quickly
- On 6/9 we added more Copepods and fed the corals with Oysterfeast

Anyone have any ideas on what could be causing this or recommendations to check?
Recent Events for background:
- On 6/7 we did a 10 gallon water change on the 62 gallon tank and siphoned the sand
- On 6/8 we added a Spotted Mandarin to the tank
- Evening of 6/8 to 6/9 forgot to turn the return pump back on the left side but there was still continuous flow from the Reefwave and other side pump. This return pump had been off for roughly 8 hours. (this is what I currently suspect to be the cause).
- On 6/9 we took the Dragon Soul out to clean bubble algae off it quickly
- On 6/9 we added more Copepods and fed the corals with Oysterfeast

