Andrew what are you using for lights again and what colors, and how long are they on for?
I had a zero nurtrean tank in my 90, My Mg was the same as yours, I feel your Ca is way high. I found much over 400 and you actualy get a slow down in growth in SPS. I used to try maintain mine at 380 to 400. I also had my alk a little higher than yours, 12 if I recall right.
I had SPS growth and color that poped, with nice deep colors. I was running Pure actinic 12 hours a day and My 10K MH for 8 hours a day, and I had to clean coraline off the glass every other day and it would plug my tunze in about 2 weeks to the point if the power went off they wouldn't restart.
personaly I think it was the extended actinic period that did it, in combanation with a elevated alk and a natural level Ca.
Steve
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