How long does it take for H2O2 to break down in a tank?

[Just John]

I am currently dealing with some dinos. I am using a UV filter and adding h2o2 twice a day at 1.5 ml/10 gal along with some bacteria. I want to keep the UV off and not add bacteria when the h2o2 is working/reacting. I know there are variables at play, but about how long should I plan for it take to break down?

 

[LiveFreeAndReef]

I believe the timeframe is about 4 hours, but Randy will know!

 

[Just John]

@Randy Holmes-Farley any thoughts on this?

 

[brandon429]

curious as to how someone is measuring such breakdown. agreed above on the orp readings that's the key down/up paradoxical timing/4 hrs avg.

 

[brandon429]

we've had countless people re input lysmata shrimp after 4 hours and they die at a rate of about 90% when peroxide is added with them in tow. to me this also really helps back up timing guesses.

 

[Just John]

I would like to keep the UV running the whole time the h2o2 is in there, but I imagine that would cause a large increase in the rate of breakdown.

 

[brandon429]

tbd I do not know, agreed neat to find out. not sure how we can measure it without orp maybe chemists have a neat trick

 

[LiveFreeAndReef]

I would like to keep the UV running the whole time the h2o2 is in there, but I imagine that would cause a large increase in the rate of breakdown.

I've been dosing H2O2 and keeping the UV going 24/7. Though, I replaced the UV bulb last night and the dinos were 99% gone today.

 

[Lyss]

So, a while ago I had hydroids in my FW tank and was looking for simple ways to get rid of them when I came across this guy using h2o2 in his shrimp tanks. I watched the video a few times and and took notes, then did a treatment in my tank and it went well. He gives a really specifically measured dose, and I can’t recall if he says the exact amount of time it takes to break down, but he does list a timeframe for keeping pumps off. I followed that and had no adverse reactions in the DT or the back chambers with livestock or nitrifying bacteria.

 

[Just John]

So, a while ago I had hydroids in my FW tank and was looking for simple ways to get rid of them when I came across this guy using h2o2 in his shrimp tanks. I watched the video a few times and and took notes, then did a treatment in my tank and it went well. He gives a really specifically measured dose, and I can’t recall if he says the exact amount of time it takes to break down, but he does list a timeframe for keeping pumps off. I followed that and had no adverse reactions in the DT or the back chambers with livestock or nitrifying bacteria.

Thanks for the link!

 

[FlyPenFly]

Curious about this because of chaeto. Been thinking about dosing it for a tank but it has a macro algae reactor that can be kept off during dosing so as not to kill the chaeto.

 

[Crabby48]

If I remember correctly it would be gone in 3 days max

 

[brandon429]

don't dose peroxide into a display. even though its safe/we know safe doses/it doesn't get rid of your targets effectively and would likely kill nontarget macros.

post a pic of the tank in challenge, let's see what's prompting the request to dose peroxide/there's better ways to fix the tank

 

[AdamG280]

What about killing cyano? Should you use something else?