Sorry to hear about your recent struggles Perry. I had a horrible case of Dino’s pop up in my frag tank after adding some black egg crate that I couldn’t get rid off for months. My no3/po4 were and still are much higher than most ppl recommend in there and they didn’t seem to be bothering my sps at all but they were everywhere. So I did a 48 hour black out, turned the lights on for 3 or 4 hours to feed the fish and then did another 48 hour black out. I then went to 6 hours of blue light only for a week, and then added white for a week and then jumped up to 7 hours for a week and then 8 hours. I have not seen any Dino’s since.
This part you can read and say get off my thread, call me a moron or whatever, but I thought I should share my experiences. Not trying to start a debate here. This is just me trying to help and you’re free to react/not react however you prefer.
I’m not sure if you know anything about my system but I do not practice a natural seawater method, but I did try to when I got back into sps. I upgraded to my current system in aug 2017 and spent the first year and thousands of dollars chasing natural seawater levels because that’s what is recommended. I should of realized this was the wrong approach when my montis that I had for 7+ years that were fine while my previous tank was neglected, started stressing and dying. And when I say neglected I mean zero testing, maybe 1 water change a year and they never looked upset. They didn’t grow much over those years but they looked happy. So I stopped chasing, and all my acros stopped dying and started growing. I have posted many pics of my acros and some grow well and some not as fast as I would like or as fast as others think they should but they’re alive and colorful. I believe this is the most important, especially in a newer system. The last time I checked no3 my DT was around 15-25 if I remember correctly and 50 in my frag tank.
DT PO4
Frag PO4
Now I’m not suggesting you or anyone should chase these numbers either, but everyone should realize these are nothing to fear. I know you had previous success with natural seawater levels but I don’t know the full details. Did your previous tank start out as a NSW sps tank or did it slowly evolve to that state? Last thing I’ll share and then let you enjoy the rest of your Sunday. Even RedSea’s nopox, which I despise, recommends 0.08-0.12 po4 for sps frags
I hope this helps in some way.