Who disagrees with this?

didy said:
"Bad information" is subjective. I know many people who have healthy fancy goldies going by the guidelines above. My two started out in a 20L, now I have them and a third in a 55. They get PWC about every other day, and the best of foods. They are healthy and show every sign of being happy.
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The majority of people do not do PWC's every other day. In your case, you are "artificially" making your tank appear larger to the fish by reducing the hormone and pollution levels by doing frequent PWC's. "Dilution is the Solution to Pollution".

If someone only wants to do weekly PWC's, then a 55G will not work. If your fish grow to full size and live around 20 years, then you should pat yourself on the back for being so diligent with your PWC's.

You should also consider one of the advanced chemical filtration products like Purigen. It's much more advanced than carbon and it does not leech phosphates into your water. It's rechargeable using bleach to clean it so it's more cost effective. It's an off-white color that turns dark brown as it gets "dirty", so you can tell how often you need to recharge it. It even helps remove nitrates from the water column as well as DOC's. It was originally invented for SW fish keepers since their fish/corals are so much more sensitive to water quality issues.
 
I have been doing every other week 50% and my water tests great. I guess thats because they are still small though.
 
mine is 30 gallon minimum for 1-2 goldfish (since 30 gallons is large enough for the filtration needs of goldfish, it is large so there is good swimming space, it is wide so that is good for pot bellied goldfish, and goldfish are social fish. Plus it is easier to sustain a low temp in larger bodies of water/thicker glass that 30 gallons can give you)

10 gallon per fish after that.
 
Jessu said:
I have been doing every other week 50% and my water tests great. I guess thats because they are still small though.
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What is the KH and GH of your water? Right now, while the tank is new and the fish are small, things might stay stable for two weeks but you should probably get in the habit of doing weekly 25% PWC's to keep the water parameters more consistent. Your KH level will likely drop quite a bit after two weeks (unless you have really hard water) and then when you do a 50% PWC, it will alter your parameters a lot more than necessary. I don't like doing more than 25% at a time so it keeps the water parameters more stabile. If you have medium to soft water with a low KH, waiting too long could cause a drastic pH crash when the KH gets too low.

What are your test results for ammonia, nitrite, nitrate, pH, KH and GH and temperature?
 
Jessu said:
I have been doing every other week 50% and my water tests great. I guess thats because they are still small though.
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Be very careful. Just because the water looks good on tests does not mean it really is good. There are many things you can't test for, one of those things is hormones which can stunt your fish.
 
I thought that the amount of nitrates also reflects the stuff you cant test for.
 
there are tests for hormones and stuff, just either really expensive and/or not available to the hobby. There used more in medical studies.
 
musho3210 said:
there are tests for hormones and stuff, just either really expensive and/or not available to the hobby. There used more in medical studies.
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Do you know any more info about these tests?
 
no, but medical studies are using hormonal tests on animals etc (to find what level hormones they have, also used on humans when medical attention is desired) and other chemicals, depends on what chemicals but it shouldnt be that hard since forensics science tests for many chemicals. Like there may not be a pesticide test at your lfs but you could get one at a more hi rate store.
 
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