I am winning against the Dino. Only time will tell. 
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Update:
Things have moved in the wrong direction over the last week with dinos increasing and corals being negatively impacted
I did break down and purchase a microscope and confirmed at least 2 dino species, Ostreopsis and Coolia. There is another that is more oval looking than the Ostreopsis, but can't confirm it is something different. There is also what looks like another species that is very small compared to the Ostreopsis and Coolia and is very fast. I will try to post pictures of all when I get a chance for assistance in confirming my IDs.
I am now moving in the direction of a tank reset. To keep from cluttering up this thread I will create a separate thread with details of what I am doing. It will take quite a bit of time to move and treat corals to try to prevent moving dinos into the 50g cube I set up. During this I will continue to maintain nutrient levels in my main display tank. This will give this method another month or two to see what happens.
@m0jjen what happened after post #493?
Definitely dose up as per that post and remove any other nutrient reducers you're using too, as @taricha said – start getting things moving in the right direction!
I agree on the feeding recommendation too – if you're feeding more than what consider your tank's correct, normal levels, then fall back to normal ASAP. (Do not underfeed either though.)
Feeding raises all nutrient levels, not just the deficient ones, so it doesn't help in the short term.
It's possible that more feeding and more frequent feeding could be part of your long term solution though.
I know, but slow and steady wins the race. Hence me starting at these doses and keep messuring to ensure i dont chock the system nor overshoot as you say. By dosing 0.02 ppm i can control it by messuring daily at the same time of the dayThen the results make sense – time to take your advantage!
If you have PO4 of 0.04 ppm (0.038) in the tank now, then you ought to dose 0.06 ppm at the least in order to get it caught up to 0.10 at the time of your dose.
But the reality is that you'd like ≥0.10 ppm – not ≤0.10 ppm.
So if you want to dose up to 0.15 ppm or 0.20 ppm because you think it makes sense for some reason, I'd easily support that as well. That would mean a dose of 0.11 ppm or 0.16 ppm, respectively.
Check your dose by testing every day though, so when you do finally reach ≥0.10 ppm you don't overshoot by more than your intention and instead you keep the current dose correct for maintaining ≥ 0.10 ppm.....at least until this is all just a memory.
Make sure to keep checking NO3 as well! You're hoping to set off a minor (and invisible) bloom of non-bacterial microbes in the tank – and they they require a steady supply!
I started my tank from scratch and still got dinos. Dry rock, dry sand, fresh rodi system and cycled with zeovit, and still got dinos. So if you do a full reset, you may still get the same problem if you stay ULNS from the start. It happened to me, just my 2 cents.
I am also debating on hooking up an Aqua 57w on my 120. Will it help? What's the best practice for hook up? (After overflow on drain lines, dedicated pump in sump, or between return pump and main display)
