My Journey with Dino's
Here is my account of having to deal with Dino's for the past 6 months. I don't proclaim that this is the only way to deal with these guys but, here is what I did to eradicate these pesky and very resilient creatures.
I tried almost all the methods others have claimed would work from blackouts, lowering light intensity, blowing the dino's off the substrate and rocks, removal of filter socks, running carbon, running GFO, dosing peroxide, turning off the skimmer, relocating my UV sterilizer to get more exposure to dino's, lowering flow in the UV Sterilizer, high flow in the tank, low flow in the tank, increasing nitrates and phosphates, dosing silica, large water changes, no water changes and combination of many of the preceding methods.
What caused it: I believe that I got the aquarium water too clean with 0 phosphates, 0 nitrates, and 0 silicates.
Type of dino's: Prorocentrum as verified with a microscope
How to attack it - Phase I:
1. Stop using any coral supplements (in my case RedSea AB+). Do not use any carbon products, or NO:PO-X. Let the phosphates and nitrates increase. (mine went to 3 and 15 respectively)
2. Start dosing Microbacter7 as directed on the bottle for High Nutrient tanks. Do this for the prescribed 2 weeks.
3. Spend some time getting the parameters of the tank to a stable state and continue dosing Microbacter7. This will take the most time as I equate this to starting over and cycling the tank. It will tank a good month for this to occur so be patient. During this time, refrain from cleaning the tank and allow algae to grow as this will compete with the dino's. I left my tank alone and did not even clean the glass until I simply could not stand to look at it. It took me 5-6 weeks with little change to get back to a stable state. I did change filter socks during this time but, I debated just removing them.
4. Lower flow through your UV Sterilizer (If you have one) to turnover the tanks 3-4 times per hour. In my case flow was approximately 500gph.
Phase II:
5. Start siphoning out the Dinos on the substrate but, try to remove as little water as you can (in my case < 1 gallon per day).
6. Start dosing silica (in my case SpongeExcel by Brightwell) as prescribed to encourage diatom growth and help out any sponges you may have.
7. Change filter socks every day.
8. During dosing of Microbacter, turn off the skimmer for 4 hours. Once on, skim a little wet to help remove as much waste as possible.
9. Keep dosing Microbactor7 at double the dose of the ULNS recommendations.
10. After 1-2 weeks you should start to see progress, less Dino's on the substrate.
11. Another 1-2 weeks you should see more and more Dino's disappear until it eventually goes away. Don't be fooled though as they still exist in your tank but you have won the battle for now.
All-in-all it took 6 mos to eradicate it in my tank however, I would estimate 2-3 mos. if you follow a similar process as I have described.
There is no quick cure so, take it slowly and it will eventually go away.
As a side note:
I did lose to Lyre-tail Anthias and my orange watchman goby lost his tail to fin rot. I had to dose the fish food with medicine (Kanaplex and Focus) during this time and I am sure this also slowed down progress.