Dosing Neo nitro killed yellow tang?

[Heart is what matters]

Hello everyone, any one has heard of fish dying by dosing Neo Nitro and Neo Phos?!
My 3 year old tank had a case of Dinos due to 0 nitrates and 0 Phosphates. I did a blackout method and dosed 5 ml of Neo Nitro, and Neo Phos to a 125 gallon system. I noticed the water got really cloudy upon the second dose, (24hrs later as instructed) my yellow tang and a file fish struggling to breathe. The yellow tang died the second night he was swimming close to the surface of the water, all other fish survived. Any ideas anyone what could’ve caused this?! I added oxygen to the tank and checked nitrates after each dosing and they were still at 0. (Hannah nitrate test kit)

Good news is that Dinos seem to have disappeared for the most part.
All my other parameters are stable and tank is looking better but Nitrates still at 0 a week after dosing 5ml daily, is something else consuming the nitrates?
Skimmer is off, no mechanical filtration at the moment, removed chaeto, only have a filter sock and uv light running.

 

[Reefer1978]

Sounds like you had a bio-bloom, which starved the tank of oxygen. Skimmer being off likely contributed to it, as it does use air for skimming.

How did. you add oxygen after each dose, and for how long?

 

[Randy Holmes-Farley Verified Community Expert]

Neither nitrate nor phosphate dosing is going to kill a fish.

Certainly could be oxygen and skimmer off is not desirable.

Could also be toxins from the dinos.

 

[Heart is what matters]

Sounds like you had a bio-bloom, which starved the tank of oxygen. Skimmer being off likely contributed to it, as it does use air for skimming.

How did. you add oxygen after each dose, and for how long?

I added oxygen by turning the skimmer on and moved my gyre extremely close to the water surface which created a huge amount of air bubbles.

 

[Heart is what matters]

Neither nitrate nor phosphate dosing is going to kill a fish.

Certainly could be oxygen and skimmer off is not desirable.

Could also be toxins from the dinos.

A buddy who owns a reef store recommended to turn off skimmer due to 0 nitrates while i dosed Neo Nitro.
But he did mentioned that dinos are toxic the tang might’ve eaten some perhaps

 

[Randy Holmes-Farley Verified Community Expert]

A buddy who owns a reef store recommended to turn off skimmer due to 0 nitrates while i dosed Neo Nitro.
But he did mentioned that dinos are toxic the tang might’ve eaten some perhaps

That would not have been my advice. Neonitro cannot be skimmed out, and the overall effect of skimming on nutrient levels is low.

 

[Reefer1978]

A buddy who owns a reef store recommended to turn off skimmer due to 0 nitrates while i dosed Neo Nitro.
But he did mentioned that dinos are toxic the tang might’ve eaten some perhaps

I don't see why the tang would suddenly eat dinos, in enough volume to be toxic and cause death, in the total darkness.

 

[Tangdora]

Keep you skimmer on as other have mention it does not remove nitrate and phosphate. Turning off skimmer is more of a last ditch fail safe if you were say to run out of your dosing liquids and for some reason not able to restocks in the next day or so. In that case shutting it off would help by allowing excess food and waste to break down on its own back into nitrate and phos while your not able to dose. But if your strickly relying on product to maintain there is no reason to shutoff. Also to piggy back off other and my use case. It’s probably not warrant to shut down even in my case mention if your don’t have good water and surface aeration from other powerheads and pumps to keep o2 levels up