New 125 g with dinos?

[Doglips56]

I’ve had my reef tank set up for almost 2 months now. I started with dead dry rock and 7 bags of CaribSea special grade Arag-Alive sand. Cycled the tank with a combination of bacteria in a bottle and ghost feeding mysis shrimp. After the tank completed the initial cycle I added some hermits (blue and red leg) and a couple of snails. About a week later added the frags and 3 small fish I’d had in QT for over 2 months (2 separate QT tanks, one for fish and the other for coral and inverts). The fish are 2 young clowns and one small blue chromis. Quickly, even before the cycle completed the tank started being blanketed with brown powdery algae. I do have some stringy stuff too, especially on frag plugs. I have been reassured over and over that it is just diatoms and an ugly phase and will take care of itself. Yesterday I decided to stir the sand and brush as much as I could off of the rocks and run my pump at a high flow rate along with the skimmer and the UV dedicated pump set at the speed recommended for algae.
This morning, for the first time in 2 weeks the tank looked really good. Sparkling and no new algae had accumulated on the glass! My joy was short lived, however, when I noticed tiny bubbles coming up from the sand bed. I took a closer look and got the photos attached. My 7 year old grandson has a little microscope so I looked at a sample from the sand bed. This is a cheap kiddie microscope so take it fwiw but it looked like brown egg shaped organisms (could not intensify any flagellae on them and also some much smaller translucent organisms. All of them were swimming around rapidly. Not in the slowish circle pattern I’ve seen on videos of various dinos. I had added 64 oz of Copepods several weeks ago too just FYI. Anyway, because of the swimming pattern I’m a little confused.
Could the stirring and 25 gallon water change and high flow have caused these bubbles to form or am I definitely facing a dino outbreak?
Current water testing:
SpGr. 1.025 refractometer
pH 7.8 Hanna
dKH 8 Red Sea test
Ammonia/Nitrites 0
Nitrates 5ppm Red Sea test
PO4 .04 Hanna
Temp 78.5
DT 125 less sand and rocks
Trigger systems 44 gallon sump
Reef Octopus classic 150
Coralife UV
Refugium has only matrix and sand in it with 2 small mangrove plants that aren’t doing well.
mechanical filtration is 2 filter cups. One has a media bag in it with maybe an ounce of BRS ROX .8 carbon and both are stuffed with filter floss which was recently changed but not yesterday.
Newer additions to the tank within the past 2 weeks are fire shrimp and cleaner shrimp. Fire shrimp is thriving, cleaner shrimp died. 1 medium sized lawnmower blenny and 4 Mexican turbo snails in addition to the handful of crabs and other snails I had stocked previously.
Everything looks like it is thriving. Corals have good color and fish and fire shrimp are all active and healthy looking and eating well.
Ive attaches a couple of pictures of the sand bed showing the algae and bubbles.
Please advise. I’m new to this forum. Have been lurking for a while but this is my first real post.

 

[taricha]

It very likely is dinos, See this ID guide if you want to compare your micriscope views, but...
1) your tank is still young, has had numerous recent additions and
2) all livestock is doing well
based on those two things I'd choose not to care or do anything different except suck up the brown masses, and let things continue to establish and let populations mature and shift.

 

[Doglips56]

It very likely is dinos, See this ID guide if you want to compare your micriscope views, but...
1) your tank is still young, has had numerous recent additions and
2) all livestock is doing well
based on those two things I'd choose not to care or do anything different except suck up the brown masses, and let things continue to establish and let populations mature and shift.

Thank you. Was having a problem with my Noopsyche lights coming on sometime overnight and running when they should’ve been off. Operator error and got that fixed. Thinking way too much light caused the explosion. Woke up this morning and algae coverage seemed lower with no bubbles all day. Keeping only very low intensity blue/purple and UV channels running right now and T5’s off altogether. May be dinos but since my tank is young I’m going to just try to ride it out for the time being, especially since everything is thriving. Thanks again!