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I missed your post from yesterday, somehow. Thank you for your reply. I just took a look in your media folder and found my sample in the picture and the first video of my most recent post to closely resemble your sample picture of the large cell amphidinium. This makes me nervous as I believe that this is the one we don't really know how to treat very well... Looking forward to your review of the videos when you have a chance to view them later.The picture looks like prorocentrum. I can't look at the vids right now but will take a look when I get home.
The UV can help with that but may need to be "encouraged" into the water column. Using a powerhead to blast after lights out and even a day or 2 with lights out as well. Lights out alone doesn't do anything but used to get into the water column in conjunction with the UV can be effective. I also siphoned into a low micron (5 micron in my case) filter sock for physical removal.
@Beardo I had both amphidinium and prorocentrum and can't find any evidence of them in the tank just looking at the tank. Everything looks good except for a few places with some small amounts of cyano. When I look at the cyano under the scope I see just a few of these guys at the edges of the cyano mat. Do you think these are prorocentrum? I'd feel a lot better if they are.
@Beardo, with the pictures you shared and the explanation of the slight concavity vs the two bars, I am very hopeful that you are correct as it sounds like prorocentrum has a better track record of treatment that works vs amphidinium. Sincere thanks for taking the time to view the pictures and movies. I'll probably take another sample to study myself with this new knowledge on Wednesday when I hope to use the canister filter for a cleanup again.
@saltyhog, I'm pulling for you that it's prorocentrum as well!