Brown Algae confirmation

[Exorcist_shuvo]

Hello reefers!
I am new to this hobby. My tank is around four months old. I am facing this brown algae situation where the algae blooms at day and disappears at night. This situation arise from the beginning of this month. I am not sure if its diatom or dino.

Please note that My nitrates were alarmingly high from last month (80+). So I start adding noppx from this month. Now the nitrates are at 30 and phosphates at 0.25.

At first I thought that its just diatom since i have high nitrates and phosphates. However after going through few threads of this forum i came to realise that diatom doesn't disappear at night. So is it actually dino situation that i am facing? What's the solution at this moment?

My tank setup -
* 48"x22"x21"
* sump with refugium & skimmer (copepod & amphipod present in the fuge)
* maxspect razor x 200w LED (photo period of 9 hours with a peaks of 5 hours)
*Livestock - 7 fishes (all are small below 4 inches), Inverts ( 3 nassarius snails, 2 mexican turbo snails, 4 bumble bee snails, 4 trochus snails), no corals yet (only added GSP frag for test purpose)
* Parameters - ammonia & nitrites (0), Nitrates (30), phosphate (0.25), pH (8.2), Salinity (1.025)

 

[Jekyl]

Coming out during the day and disappearing could mean dinos.

 

[Liftoff]

Can you test for SiO2 just to be sure?

If Dinos, physical removal and turning off your lights might help (Source: https://www.bulkreefsupply.com/content/post/5-minute-saltwater-aquarium-guide-ep27-dinos )

 

[Exorcist_shuvo]

Coming out during the day and disappearing could mean dinos.

Yes that's what I am worried about. However I have read dinos thrive when the nutrients bottom out where mine are high. In my case should I continue dosing nopox?

 

[Exorcist_shuvo]

Can you test for SiO2 just to be sure?

If Dinos, physical removal and turning off your lights might help (Source: https://www.bulkreefsupply.com/content/post/5-minute-saltwater-aquarium-guide-ep27-dinos )

Thanks for your feedback.
I am not certain if I can do that since I don't own a microscope. I have to check with my LFS if they can test it.
I will turn off the light for next few days to see if there is any progress.

 

[Liftoff]

Hi Shuvo,
Any updates on your problem ?
Best
Liftoff

 

[Lavey29]

Doesn't look like dinos to me. Just ugly brown algae in a 4 month old tank. If you have no corals turn the lights off. Fish don't need lights.

 

[Exorcist_shuvo]

Hi Shuvo,
Any updates on your problem ?
Best
Liftoff

Still the same. I am turning off the light from today. Lets see if its changing the scenario.

 

[Exorcist_shuvo]

Doesn't look like dinos to me. Just ugly brown algae in a 4 month old tank. If you have no corals turn the lights off. Fish don't need lights.

Does diatom go away when there is no light?

 

[Lavey29]

Does diatom go away when there is no light?

Mostly yes