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Hello and welcome back to JustAnswer. I just reading your previous questions about the aquarium and see that this has been an ongoing problem. Some clarification will help me figure out the best way to help.I see that you have a black moor in the tank. How big is he from mouth to tail tip? Are there other fish in the tank? If so, what?How big is the tank in liters or gallons?You said in this question that the tank has been set up for ages, but in December 2012, you said you emptied and refilled it. Is this the same tank?What is the pH of your water as it comes straight from the tap? Thank you.Anna
Thank you for getting back to me. Don't worry about the pH. I'm not sure who told you it was a problem, but a black moor is a variety of goldfish, and they do best with a pH of at least 7.2, and higher cna be better yet. If the pH drops below 7.0, that alone can make a goldfish sick. If it goes to 6 or below, it is likely to be fatal. Different kinds of fish have different pH requirements, and we can't assume that all fish need the slightly acidic water that some of the tropical rain forest species do. Yet, that's what many pet store staff believe. So, absolutely do not add any more pH down, and leave the pH alone. The more you try to change it, the worse for your fish. You can confirm this information on pH on the following reputable goldfish sites:http://www.goldfishconnection.com/articles/details.php?articleId=125&parentId=10http://www.goldfish-emergency.com/viewpage.php?page_id=179The ammonia is another story. As little as 0.01 ppm can cause illness under the right circumstances. Goldfish need ammonia at zero. The biggest problem is that a 40 liter tank is too small for a goldfish this size, and you will always have trouble maintaining water quality. Goldfish produce a tremendous amount of waste, and your tank has probably not been able to cycle properly because of that. It used to be recommended to have about 4 liters of water per inch of fish. That still holds true for tropical fish, but not for goldfish. I find they do best with about 100 liters per fish, regardless of size. I’ll share my own experience with 12 inches total of goldfish (3 fish). They are in a 90 gallon (about 340 liters) tank. I have an undergravel filter, a hanging filter, and a powerful canister filter. It takes all three of those filters to maintain perfect water quality. Regardless of tank size, frequent water testing and changing is needed. Goldfish tank size is another area where pet store personnel give out incorrect information. They may not know, or they may simply want to sell more fish. In your present tank, you'll probably need to do a weekly water change of 25% or twice a week water changes of 10% to keep the ammonia down. That may not be enough. Frequent testing will let you know. If you get a bigger tank, don't follow the pet store advice of putting a large goldfish in anew tank to cycle it. That kind of advice is outdated and is only likely to result in a sick or dead fish. We now usually cycle tanks without fish. There are other ways to cycle a tank. The following website gives detailed instructions and also explains cycling in depth.http://animal-world.com/encyclo/fresh/information/CycleAquarium.phpYou'll have to make up your own mind on what to do about the ammonia, but I recommend you throw away the pH Down. It is bad for your fish. If you have more questions, let me know by clicking on REPLY. I hope you'll be able to get everything under control and your fish will thrive.Anna