Algae ID help - microscopic view

[Snot Otter]

My nano tank is about four months old. I made a post last week regarding my concerns with algae. It certainly looks like dinos and something else. Under the microscope, however, nothing appears to be moving. I've been dosing phytoplankton. Some kind of green algae is starting to take over the rocks, and the sand has brown spots.
What do you think?

Parameters:
Temperature - 79 degrees
Salinity - 1.024
pH - 8.0
Ammonia - 0
Nitrite - 0
Nitrate - fluctuating between 0.07 and 1.7 ppm, but it did bottom out at 0 for a couple of days several weeks ago
Phosphate - fluctuating between 0.03 and 0.05 ppm
RODI TDS - 0

 

[CoralB]

Looks like diatoms

 

[Ro Bow]

Looks like diatoms

+1

 

[DaJMasta]

The look on the sandbed seems to be diatoms to me, under the microscope the more geometric looking ones are also, but the round ones look like some other kind of algae. Do the smaller round brown algaes move under the microscope? Dinoflagellates should move, and some other kinds of plankton do. Speaking of, what kind of phyto are you dosing? Isochrysis is also mobile (and pretty small compared to some other plankton), but maybe there's a brown algae that you're dosing that could explain the presence of those under the microscope.

 

[Snot Otter]

The look on the sandbed seems to be diatoms to me, under the microscope the more geometric looking ones are also, but the round ones look like some other kind of algae. Do the smaller round brown algaes move under the microscope? Dinoflagellates should move, and some other kinds of plankton do. Speaking of, what kind of phyto are you dosing? Isochrysis is also mobile (and pretty small compared to some other plankton), but maybe there's a brown algae that you're dosing that could explain the presence of those under the microscope.

The smaller round algae does not move under the microscope. The bottle of phytoplankton I'm using contains Nanno, Iso, Treta, and Thal. It's the only thing I'm dosing, and I dose about 5 ml a day.

It has been suggested to me that the smaller round algae could be a strain of dinoflagellate called amphidinium. The lack of movement is perplexing though.

 

[DaJMasta]

Not sure I have an ID for the small one then, don't think it's the ones you are dosing (nannochloropsis is small and green, isochrysis is small, brown, and usually zipping around after first mounted, tetreselmis is bigger and darker green, and thalassiosira is maybe the closest in shape, but should be more regular looking as it's a diatom).

 

[mandyvan]

Look at this cool critter I captured a video from my phone, lots of movement on its left side at the beginning. Now I can hook it up to my PC and go into Camera app and just snap the pics or videos there, much easier!

- YouTube

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According to Reddit, it’s a blood-sucking shrimp parasite. Here on Reef2Reef, it’s a harmless mud skipper.

 

[mandyvan]

Ooops! I thought I was posting that in a different thread that I started. I think that happens when I leave too many browser tabs open on this site on my phone at once.