Dinos and H2O2

DexterKarin

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I'm really trying to understand this..
After a long time of 0 Nitrates and a fair amount of GHA, I got Dinos on Dec. 14. I started with the UV, reducing the photo period, dosing neonitro and bacteria dosing until I got the microscope that confirmed Ostreopsis. It was not a bad infestation, only on rock. In the past I had tried raising nitrates by feeding more and that did not work at all. I am fully stocked in a 30 gallon long with about 23 gallons of water.
I am guilty of throwing a lot at the Dinos. On Dec 24, among the other things, I started 7 days of 2ml H2O2 dosing at night with the UV on.
By Jan 5, I saw no more Dinos. I did a 1 gallon water change and added 20 hermits (bringing my total to about 25) and a couple more snails. I started adding AF Life Force and dosing silicates once a week and now every two weeks because I think (microscope) my diatoms were very few.
I did at least one more manual removal of hair algae. This is how I was managing it for months.
By Jan 20, the GHA has totally disappeared. It has not reappeared. I have not had any experience with cyano. My tank is really clean looking and I'm a bit worried about my CUC.

My question is if it is most likely that the H2O2 did away with the GHA? And if so, given how many posts their are about GHA, why is this not the standard way of treating it? A friend of mine said many people liberally and regularly dose H2O2... and that it works like ozone. I am in no position to recommend this so I wanted to ask here how the experts think about this.

Thank you.

Background info if needed:
30 Gallon AIO (23 gallons of water)
No protein skimmer but have one to add.
Filtration with floss and carbon bag
Nitrates historically 0, now maintaining positive and I shoot for 5-10 with some neonitro dosing. Will look at ammonia dosing soon.
Phosphates 0.20 to 0.60. Use some phosphate E to keep on the lower end of that range.
Alk: 8.6-9.2 with AFR dosing
Salinity 1.0025
Temp 78F
Livestock: 2 clowns, midas blenny, springerii damsel, orchid dottyback, ceriths, trocus, astreas, 20 hermits, 3 pepperment shrimp, one candy cane pistol shrimp and pin cushion urchin, lots of coral including sps and lps and a frag of palys.
 

Randy Holmes-Farley

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My question is if it is most likely that the H2O2 did away with the GHA? And if so, given how many posts their are about GHA, why is this not the standard way of treating it? A friend of mine said many people liberally and regularly dose H2O2... and that it works like ozone. I am in no position to recommend this so I wanted to ask here how the experts think about this.

There are tons of threads on peroxide dosing to kill pests, and many folks make overly simplistic assertions about it turning into only O2 and water. Some of the more advanced methods use decvices to try to reduce its effect on things like live rock while allowing it to uve useful effects on the bulk water.

But hydrogen peroxide dosing is not a magic bullet for anything (IMO). If it is dosed in amounts to kill one organism, it will kill others. Some folks do use it to kill pests, but it is not something I recommend, and your story may be an appropriate cautionary tale: kill off competitors and dinos may result.
 
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DexterKarin

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With that H2O2 treatment then I have killed bad and good things and the tank is a bit sterile? Other than the mud and a bit of silicate dosing would you do anything else to get the system back on its feet ? Nothing at the moment is going terribly wrong btw.
 

Randy Holmes-Farley

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With that H2O2 treatment then I have killed bad and good things and the tank is a bit sterile? Other than the mud and a bit of silicate dosing would you do anything else to get the system back on its feet ? Nothing at the moment is going terribly wrong btw.

I would not say it is sterile. There are loads of different species of bacteria with difference sensitivity to hydrogen peroxide. But if you added enough to kill algae, it is likely you added enough to kill some species.
 

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