Dino ID help?

Bucs20fan

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Pretty sure this is prorocentrum. I could be wrong but looks like it. If so any ideas to combat them?

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Either that or large cell amphidinium. Where are they at currently in your tank. Do they go away at night?
 
They are on the sand a lot, starting on the glass a little, and on the skeletons of my torches and hammers, and about halfway up on rocks. Greatly decreased population at night heavy at peak lighting
 
Some
Pics under white light
 

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Amphidium and keep removal simple. Prepare by starting with a water change and blow this stuff loose with a turkey baster and siphon up loose particles.
Turn lights off (at least white and run blue at 10-15% IF you have light dependant corals) for 5 days and at night dose 1ml of 3% hydrogen peroxide per 10 gallons for all 5 nights. If you dont have light dependent coral- turn all lights off.
During the day dose 1ml of liquid bacteria (such as bacter 7 or XLM) per 10 gallons.
Clean filters daily and DO NOT FEED CORAL FOODS OR ADD NOPOX as it is food for dinos.
Day 5,, you can start with blue lights - ramping up and work your white lights up slowly
 
I have been dosing peroxide twice a day for 3 weeks and microbaxter 7 every day. It hasn’t touched them.
 
I have light dependent corals and nems. So running the radions at 10% should help I assume? Do not dose nitrate or po4? Nitrate doesn’t even show up on an api test even.
So running blues at 10%, how large of water change? I also have UV running. So just siphon before water change and reduce light while dosing bacteria? Won’t this keep my nitrate bottomed out though?
 
I can tell you what I did to beat but not eradicate a combo of amphidinium and ostreopsis. I can also tell you it seems like there is no one size fits all solution but a laundry list of possible things to try. Don't get discouraged.

What I did:

My corals were being smothered, dinos had a grip on every inch of the tank

-Installed a UV (didn't feel like it helped much but can't be sure)
- Daily testing and dosing Neophos/nitro accordingly
-cut my lighting period by 2 hours and turned down whites/greens/reds to basically 0, also cut intensity of blues by 25%
-alternated dosing Live Rock Enhance and MB7 daily
-i scrubbed the rock and siphoned the sand daily the best I could, sometimes twice a day.
-cut plastic cutting boards to fit around my rock work to shade the sand. Held them in place with zip ties on magnetic frag racks.
-ordered the Jar package from Tampa Bay Saltwater (arrived after I turned the corner on dinos)

I no longer have any bubbles or strings on the rocks at all. My corals all made it (barely). After I got through it, the tank almost had a spring like event period. Things started appearing like pods, baby trochus snails, etc. Really cathartic after what felt like a near tank-death experience. Now I still have a few lingering but manageable areas of amphidinium on the sand. I received the TBS package of sand and rock which I have in a separate tank for observation. I added the sand as a new layer on top of my display sand a couple days ago. I'm waiting on adding the rock which I will soon after I confirm there aren't unwanted hitchhikers. Hoping the real ocean sand on top will help keep the amphidinium at bay long term.

I'm no expert, but it feels defeating dinos is purely guess and check until you find something that works for your tank. The good news is the resources of all of the things you can try are readily available on here to read through and gather all the info you can to put together an action plan.
 

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