I own a 32 Biocube that has been running for over 3-4 months. I added fish about 2 months ago after the tank had fully cycled. The tank has been running quite smoothly with not many issues at all. This is why the die off of my fish this morning came as such a surprise. All the invertebrates and crabs seem fine.
Bio-load:
Snails: ~20
Hermit Crab: ~4
Sea Urchin: 1
Brittle Starfish: 1
Clownfish: 2
Royal Gamma: 1
Lawnmower Benny: 1
Corals: 10
Here are my water parameters (tested by my LFS):
Salinity: 1.025
Temperature: 77.6 (no history of a temperature spike or anything based on my sensor)
Ammonia: 0.1 (I think because the fish were dead for a couple of hours in the tank)
Nitrate: 0
Calcium: 457
Phosphate: 0.1
Alkalinity: 146
PH: 7.6
Magnesium: 1380
Nitrite: 0.3
The day before I did a huge water/tank clean where I cleaned the rocks with hydrogen peroxide to remove green hair algae. I had to remove many of the rocks from the aquarium in order to do this. I only left them out for an hour or two. Unfortunately, this morning I woke up and all my fish are dead. Honestly, I'm leaning towards ammonia poisoning due or bacteria bloom due to the sand bed being disrupted, but I'm not entirely sure. The reason for this is that I noticed the water being a bit cloudy after everything was cleaned. It's still a bit cloudy actually. I'm wondering what I could've done different to prevent this from happening in the future and to figure out what possibly happened.
Bio-load:
Snails: ~20
Hermit Crab: ~4
Sea Urchin: 1
Brittle Starfish: 1
Clownfish: 2
Royal Gamma: 1
Lawnmower Benny: 1
Corals: 10
Here are my water parameters (tested by my LFS):
Salinity: 1.025
Temperature: 77.6 (no history of a temperature spike or anything based on my sensor)
Ammonia: 0.1 (I think because the fish were dead for a couple of hours in the tank)
Nitrate: 0
Calcium: 457
Phosphate: 0.1
Alkalinity: 146
PH: 7.6
Magnesium: 1380
Nitrite: 0.3
The day before I did a huge water/tank clean where I cleaned the rocks with hydrogen peroxide to remove green hair algae. I had to remove many of the rocks from the aquarium in order to do this. I only left them out for an hour or two. Unfortunately, this morning I woke up and all my fish are dead. Honestly, I'm leaning towards ammonia poisoning due or bacteria bloom due to the sand bed being disrupted, but I'm not entirely sure. The reason for this is that I noticed the water being a bit cloudy after everything was cleaned. It's still a bit cloudy actually. I'm wondering what I could've done different to prevent this from happening in the future and to figure out what possibly happened.