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That's right.

To treat internally, add a drop of the oil to food. Flakes or wafer type foods are best. Anything dry that will sink to the bottom of the tank. To treat externally, add 1ml to 20L for the whole tank treatment. This is a more dilute dose than the "Diseases and Diagnosis" post. But I'd prefer we go with a lower dose. How big is you tank ? I realise I'm working in metric, so let me know the dimensions of your tank, just to be sure. A repeat dose after every 2 days is a good idea until symptoms are cleared. Then a 50% water change. Followed by another 50% water change 2days later. Then add any filter media you saved back into the filter. Please note: Treating shrimp diseases is still a very new science. There is no exact doses to be used. There is no specific medication for specific diseases unlike the fish keeping side of the hobby. You will not see Oregano Oil being prescribed for diseases anywhere else (yet) for shrimp except on this forum. In many ways we are pioneering things with the shrimp industry. So when I tell you to use 1ml to 20L, it's not an exact science or a proven dosage. If you have a quarantine tank, it might reduce the risks. But what I do know of Oregano oil is that it is powerful stuff against bacteria, it will work if we are dealing with a bacterial infection here, which you seem to be confident it is. Ah, I get it now.

@jayc or anyone else, could you please go over how to dose this oregano oil in water, just to make sure I don’t nuke my tank. I only have my tiny HOB and dual sponge filter. Oil will be here tomorrow and I’m nervous about killing my tank. Filter media will be moved to a 1.5 gallon tall container( beverage type container thAts tall and deep), with the sponge filter. I’ll leave the HOB without ceramic media etc for flow during treatment. I will be taking a gallon of tank water out for the container my filter media and sponge will be running in for a few days, before dosing. I places a blanched cucumber in tonight, they swarmed it for the first time, ever. Looking at the shells on some of them, it’s 100% bacterial( external as well as possibly internal). I don’t know why. I thought my water was in good shape..... I’m terrified of something going wrong. Hopefully I can get it all together, and this is successful.... also, than you all for the help. It’s greatly appreciated.

filter media removed from HOB, and spong lenfilter assembly completely removed. Both are in a container of tank water until treatment is over. About to mix up this oregano oil water. I plan to add some BacterAE and shrimp fit. Let it sit for a while. That SHOULD impregnate the BacterAE/Fit particles with some oil. I’ll do some tablets later

Additionally, I want to use diluted oil on the food I add, too. Correct?

I have Black Galaxy Pinto, Red Galaxy Pinto, Red Wine, Blue Shadow Panda and CRS. My previous CRS has round egg, unlike these which are long and round.

Those eggs are very early so will probably be about 3 weeks before those hatch? Always exciting to get to the next/new step! You have a great selection of shrimps there, and the tank looks good! Good to hear it is going well Great photos.! Simon

No shrimplet yet, I only notice the eggs, yesterday, I have spotted 4 crabs at one time, but bought another 4 a week ago.

Great photo of early eggs, yellow yolks! Do you have any shrimplets? How are you doing with the small crabs? Simon

Haven't been on this site recently, and the site was also off line, My shrimp has been do well, been sorting out my coura tri. had to change it's tub, turtles getting bigger and fighting. anyway my Black Galaxy Pinto has eggs, but it looks strange, previously my CRS had egg, they were round, these are long. My Turtles

If you try to put bacteria from a pH 7.5 tank into a ph 6 tank, you will probably kill off the bacteria right away. In my experience + forum reading, you have to very slowly acclimate the nitrifying bacteria to low pH. Let me tell a brief story: In my current tank, when I first set it up cycling, the pH with UNS controsoil was some number around 6 and I would add bacteria from a bottle and wait and wait and the cycle would never go thru. Eventually I got impatient and decided to "cheat" by using household ammonia (which raises the pH because it is basic, instead of ammonium chloride, which is slightly acidic) and also adding a little bit of Potassium bicarbonate or Salty Shrimp GH/KH to bump up the pH a notch. When the pH was above 6.2, the cycle would go thru, but if the pH falls below 6, the cycle will stall. Eventually I just added shrimp anyway and at first they were fine, but within a few days, the pH went down a little bit and the shrimp became more quiet. (Nobody died, though). After a few more days, the shrimp resumed activity. During this entire time, I never saw ammonia with the test kit and I added a little prime anyway just in case. But the point is even then, the shrimp can "feel it" somehow. Anyway, in the future what I will do is first grow bacteria + media in a jar at high pH to get the numbers up, then very slowly bring down the pH to acclimate the bacteria. Then I will add this to my tank with substrate and plants and etc. The point being that this way I don't wreck my buffering substrate with the higher pH. Many asian shrimp people have pH below 6

This tank: https://www.marinedepot.com/aquamaxx-rectangular-low-iron-rimless-aquarium-17-1-gallon 20L is around 5.2 gallons. I ASSUME there is around 12 gallons of water in there after water displacement from substrates, rocks, etc. so I assume 2ml of oregano oil TOTAL to that water volume. Add the oil to RO outside the tank, shake hard to combine, and dump it in?

Shrimp on the oregano leaves! I don’t know, however, if they can get anything off them. I blanched in boiling water for 30-45 seconds, but they weren’t that soft.....

Lol sorry jayc but I think he meant he had already ordered a different one, but then he found the one he linked and ordered that instead.

Well...... that’s awesome. update: Performed an immediate 10 gallon water change. Water matched within 15 TDS, exact PH l/ GH. Didn’t know what else to do. Lost 15-20, all tiny baby’s toast( dead). I dunno, it almost killed the corys cats too. Things have settled down, filter media back in. I dunno, maybe there is enough oil left over to help heal them. Assuming they don’t all die anyway.