H202 In The Shrimp Tank

Hello and welcome to Marks Shrimp Tanks

Today I am going to show you how I use Hydrogen Peroxide in a Shrimp Tank.


This is 100% safe at the dosage below.

I have tested this for months in nearly all my tanks including the ones which have expensive shrimp In them.

This combined with me adding the bacteria of my choice has resulted in a very good environment for shrimp to live in.

How Does It Work?

H202 Hydrogen Peroxide is a Oxidizer

What this means it that it decays organic material, the higher the percentage of Hydrogen Peroxide used the bigger the reaction.

What I should make very clear is that we are using 3% Food Grade Hydrogen Peroxide, using a higher % than this in any tank will probably lead to the deaths of your animals.

At this percentage it is safe for us to handle and can even be used for other things like mouthwash, I have personally also used it to clear bad ear infections.(IT WAS A GODSEND !!)

The massive benefit this will have over any other treatment that we use like salting as an example is that the end result of H202 oxidation is just pure water and pure oxygen which are very beneficial to the shrimp.

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We have all been there, dead or dying shrimp and in alot of cases the remain shrimp are lethargic.

I always wondered about using Hydrogen Peroxide in a Shrimp Tank so I set about doing some research, what I uncovered varied from people using H202 spot treating for Algae to people killing entire tanks of fish and shrimp. NOT GOOD

The fact that other people had tested this before and had bad results didn’t mean we would have the same results.

The word chemical In my opinion gets bad press when in fact we are surrounded by chemicals, chemicals make up the air we breath and the water we drink and in fact Life on earth wouldn’t exist without chemicals.

What we have to do that mother nature does to perfection is find the right balance of chemicals to do a job.

In our case its H202.


My first test was carried out on a tank that was infested with string algae, now this wasnt like all the other string algae I had in other tanks this stuff was slimey goo, this made it almost impossible to remove manually, so I had to come up with another solution.

How could I remove this stuff and it not effect the plants or shrimp?

H202 was the answer, In such a low dose it would in fact oxidize this very thin algae.

But we had another problem H202 will also kill bacteria!! for the amount of time it is active it will oxidize bio film and filter bacteria.

The solution was very very simple ..simply turn of the filters while the H202 is active.


For us this is a god send because H202 will really only oxidize the surface it contacts so as long as you turn off those filters the bacteria living in them will be safe.

The initial dosage I used was 1ml in a 50 liter tank, it wasnt until I reached 10ml per 50 liters that I started to see oxidation in the algae, this is pretty obvious because you start to see air bubbles trapped in the algae Itself.

I also knew that I would have to have a proper dosage ratio that was safe for people to use so I measure the water volume in the tank which came out at 45liters of water not 50.

What this meant is that we used 1ml per 4.5 Liters which is a ratio of 1ml per Gallon.

I eventually tested up to 2ml per UK Gallon In this tank when I started to notice the shrimp acting erratic, I tested this same dose in a tank the same size and also got the same reaction, so I think I hit the upper limit of what I considered safe for the shrimp.

Next step was to find a dose I could use whenever I liked so I decided to back of the amount by one quarter, which left me with the dosage of  1.5ml per UK Gallon or 1.5ml per 4.5 liters.

Now that the testing was done and I had no shrimp losses at all I assume this is very safe, Most algea in the tanks I used this in have gone and the plants that remain are thriving.

I also notice that this is safe to use with baby shrimp in the tank as I have young in all my tanks if anything there are more baby shrimp since I have started doing this compared to before testing.

Lets go over the benefits

1.Removes Algae

You will see algae losing color and eventually it will just disappear.

2.Kills Bacteria And Stops Fungal Infections (I have a feeling this will cure green fungus)

This also does away with you needing to draining 100% of your water like I recommended in my previous videos dealing with bacterial infection.

3.Cleans The Tank

Noticeable removes organic waste.

4.Pre acclimation treatment

I would use this on new shrimp before you add them to a tank, simple open the bag and add 2 drops per 100ml of water, this will oxidize any ammonia or nitrates and potentially deal with unwanted parasites.

5. Adds pure oxygen

Shrimp like all animals that need oxygen to survive do better in a slightly oxygen rich environment.

6. Higher survival rates

A Healthy animal will always thrive in the right conditions, this helps them do just that.

This more or less gives your tank a fresh start but with a filter that are already cycled, yes you do lose some biofilm build up on the glass but it grows back pretty fast if you use a bacterial supplement anyway.


Lets go over dosing again one final time just so this is super super clear.

New as of 1.3.19 H202 Dosing Calculator Credit to Del Clarke for this.

Simple Dosing which may be more useful to most of you.

  1. Measure the water volume of the tank to find your liters or gallons.
  2. Turn off those filters.
  3. Use 3% Hydrogen peroxide at 1.5ml per gallon or per 4.5 liters.
  4. Evenly spread your hydrogen peroxide across the surface of the tank.
  5. Give the water a gentle stir with your hand or something similar to spread out the H202.
  6. WAIT for one hour
  7. Turn those filters back on.
  8. The same week do a water change and add your favorite bacterial supplement back to the tank-

The other thing to note especially if you are using this for algae control is to look at why you had algae in the first place, are you doing enough water changes? are you over feeding? is your lighting on to long or do you have the light to close to the tank?

In my case where my algae was the worst my light was just to close, In the video when I get round to making it you will see I have left a tank specifically with no water changes to induce algae just so you can see for yourself this working.

You should also not that it may take you doing this treatment 2-3 times to get completely rid of stubborn algae, Once you do however you will notice a difference in your plants as they seem to get a boost.

I have a feeling this will revolutionize the way we keep shrimp if you follow my guide and I would also like to see some of your results especially to do with bacterial infections, green fungus and baby shrimp survival rates. do your shrimp live longer ?

Happy Shrimp Keeping.