Sorry about the paragraphs thing I just type and type sometimes.
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Some fishes tolerate wide scale of water values naturally but some fishes don't. Adaptation to different kind of water takes hundreds if not even thousends years in natur - so it won't happen faster in your tank either..
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My point with this is, unless you bought your fish from another country or from across the country chances are they are already used to whatever PH you have locally. If your fish came locally they are already in similar water. I only know of one LFS locally that keeps his PH neutral out of the 40+ that I have visited. That being the case their water isn't much different that whatever comes out of your tap. Since most freshwater fish a breed on fishfarms in huge vats nature really hasn't got anything to do with it. The people who have the burden of getting fish adjusted to different PH levels are you LFS since whatever they were living in before they got them is more than likely different.
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People also need to realize that water isn't just water. It's different here or in England than in Amazonas. Our tap water it's quite different than water in lakes and rivers..
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I think you misread what I was saying with this one. I said your water is your water. Meaning that whatever comes out of their tap is what it is. They are not going to change the molecules and atoms that make up their water. What is missing in the water is the bacteria that the fish need to make it a healthy enviroment, hench the reason for the cycle. What is has too much at least in the USA is the chlorine added to the water, that's why you dechlorinate the water before adding it to the tank. You can eliminate the toxins in the water to make it safe but the cycle adds what is needed as do any living creatures in that water. (yes, they add bad stuff too but that's why maintainance is important after that point)
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So, what was your point? If you don't want to pay, just sit on chair and do nothing? Isn't it easier then to buy fishes that are naturally able to live water that you have?
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This goes back to the fish being used to the local water. Yes, you can do nothing if your not trying to breed. It is very rare to have fish die form PH being the cause unless it is so far off the scale that it's a terrible shock for them. You will find that out within a day or two of getting the fish if that's the case. Fish die of more often of Nitrite, Ammonia, disease and bacterial infections than anything else. PH is the cause if you go into Petsmart with dead fish because they want to sell you a ton of stuff that you don't need. If a fish dies from PH it is because of drastic fluctuations. If a PH is stable even if it is high or low they will be fine.
As far as fish needing certain ranges of PH to survive that too is a crock. I have fish personally that books and internet sites specifically say they need 7.0 to live and have not died in 8.2-8.6.
I haven't lost a fish in a really long time, about 2 years. My PH is still over 8.0 and everyone is happy. Additionally, you can go to ten different places to check what PH a specific fish requires and get ten different answers.
As a breeder, certain fish need a certain PH in order to breed so that's when you need to do something about it. Using PH up & down just stresses the fish because that stuff just does not create a permanent fix. It may work for a few weeks or longer if your lucky. That goes back to what I said about YOUR water being YOUR water, it will go back to what it once was because that is the way it was.
If anyone disagree's with this you can try it yourself. Set up a 10 gallon tank with standard aquarium gravel, plastic plants and a few feeder fish. Set it up just like the average Joe would who gets a new aquarium without anything special in it like driftwood, crushed coral or whatever else. Use a regular HOB filter or UG or even both. Let the tank cycle, then when everything has stablilized check the PH. For example if it's 7.8 and just for experiment purposes, try to get it down to 7.0 by using nothing other than PH Down or Proper PH. Follow the directions and do as directed and do whatever it says to get it to neutral. Once it's neutral, check it again every few days. You WILL notice that the PH will go back up. Within a month or two without further PH chemicals it will be back up to 7.8. More than likely in this process your fish will have died by now or are stressed out and ill or weakend so bad their days are numbered now.
I'm not a scientist or marine biologist but I have certainly learned my lesson after keeping fish for over 18 years when to leave well enough alone. The fish aren't concerned with having PERFECT water to live in since they don't have perfect water in the wild, only their owners are. As long as it's not toxic the fish will be fine and don't care. Try the above experiment and prove me wrong. If you prove I am wrong and you keep your PH at 7.0 with that experiment you can then go to Petsmart and brag to them that you proved an idiot wrong online and you have neurtral PH.