I haven’t read the whole thread, but would like to leave a comment here in regards to high nutrients.
I was always told to keep pristine water for SPS. I ran ZEOvit with great success, but very VERY little room for error. .5dKH swing? Goodbye a Coral or two. While I thought my SPS were so beautiful and great, I never realized until my tank now and looking back that they were so weak and brittle.
I stopped running any methods to keep nutrients low. My Chaeto Reactor on my 120 was shut down for 2ish months without my knowledge. I was feeding heavy with very very high nutrients.
During this point, I didn’t know my Reactor was off nor my nutrients were insanely high. I had daily growth on Acropora and colors that looked like I had boosted the saturation on a photo editing app.
Wasn’t until I realized my Reactor was off and I tested my nutrients. Nitrates were 15-20ppm with my Phosphates sitting around 1.49-1.53ppm. Yes, 1.53ppm at its peak!! This is when I was shocked and added a small amount of GFO to bring it down and started playing with my tank. My Corals health began to decline a little, growth and Coraline algae slowed greatly. I then hit 1.7ppm in Phosphates and realized I need to chill on feeding.
I had very little algae which I don’t blame on nutrients. Small amounts of Cyano as the tank was barely 6-7 months old, I’d throw that under new tank syndrome. And a dirty sand bed because I don’t do water changes and didn’t stir the sand.
My Sand now remains very white (with some snails added to stir). Phosphates are naturally coming down and sitting at 0.93 last I checked 3 days ago. Coral growth is back to daily growth and colors are just as vibrant as before. All thanks to natural macro algae nutrient export and a Skimmer that I let sit for a week and a half before emptying.
I’ll never chase low nutrients again. I’ve never had such thick Corals that require me to use a bit of strength to cut.
Here’s a picture of proof for my Phosphates on April 8!