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Palisade

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  1. I guess it depends on their pond setups. My neighbors with small koi pond (with plastic lining) do not really do water change, but they use filter, and they have few water lily pots in it, and they have to clean/suck fish wastes from the bottom regularly, and add some water to refill it, maybe that?s some water change. Large goldfish and koi ponds that I saw around Nara and Kyoto temples in Japan are left as they are, naturally.
  2. Yes, I see. itch is caused by Ich. And the sores from the parasite can open door for bacterial infection. If bad bacteria stay deep in the substrate, changing water won?t affect their population in the aquarium. The point of avoiding waste accumulation is to have many plants to uptake wastes for plant growth as they are released by the fish. Bacteria (good or bad) feed on wastes, so if the wastes are quickly used up by the plants and their roots in the substrate, bacteria can not accumulate to a high level that will harm the fish. I would think that in a heavily planted tank with under fish stocking, there would be hardly any fish waste accumulation to cause proliferation of bad bacteria. In a sparingly planted tank, it would surely be a problem. I am afraid you did not read my post I don?t think anyone wants the fish to suffer. So before I contemplate for a change, I try to find out all the variables and alternative reasonable solutions to a new setup.
  3. Penguin, how/why does your pH change over time? Are the causes from your substrate, bogwood, aeration, etc…? I don’t think goldfish cause a change in pH. As for kH, I am aware that injecting CO2 will decrease it. The plants should be able to take up CO2 from goldie respiration for decent growth with extra CO2 injection. Do you inject CO2? I wonder what else that cause a drop in your kH. About the hormone, where did you read that? From what I understand, any hormones (which are protein) released from the fish would soon be degraded by the bacteria in the water in the matter of minutes, and the plants can absorb the degrading substances as nutrients. There should be no accumulation of any hormone. Devilduck, I see your point about providing a healthy env for the fish, and you made it very clear with the bleach example but I also read that some people have been successful with a natural planted aquarium with healthy discus in it without water change! BTW, discus are very sensitive to water parameters. Although goldies produce more wastes than discus, but the concept of nitrogen balancing (or a balanced eco setup) would work for any type of fish, I was told. Thanks for mentioning the Python siphon, Sakura. Sounds like a very useful tool. I only had short length siphon. I will look for it. As for bacteria, did you mean itch or something else? I guess when that happens, a major water change must be done and the affected fish must be quarantined. Normally, when a tank is properly cycled, good bacteria would outnumber bad bacteria, so that may not be an issue. I agree. In the past, I had hornwort and anacharis in goldie tank, and they were not touched by the fish. They grew very fast so they must absorb a lots of fish wastes in the water. But I did not think about their functioning as nitrogen sink at the time. They, of course, also take in other macro and micro nutrients from the water as well, beside nitrogen. So I plan to have more plants like these to balance out the fish wastes. Thanks everyone for your inputs. I shared many of same thoughts with you about regular water change, which had become a chore. There has to be a better way to enjoy goldies without lots of weekly water change, likely to mimic a natural pond outdoor. I recently read about Diana Walstad model and am thinking about extending that concept to goldie aquarium as an experiment in the near future.
  4. Hi all, I joined the forum recently, and have mostly read in the past week. Just want to introduce myself and ask a few questions. I had kept goldfish before as many as 6 at a time when I didn?t know better, under minimum planted tank (mostly floating hornworts) with gravel substrate. My last attempt with goldfish was in a 30g aquarium, but when I got busy with school and work, and did not change the water as often, the fish eventually died off. I still want to keep goldfish again after reading about their long life if raised properly. But I also want to do it the easy way without frequent water changing and mechanical filtration. So is it possible to keep goldfish healthy in a very large aquarium with heavily planted tank without water change? For example, if I keep only 5 goldfish in a 120g aquarium with lot of planting and sufficient growth light, the water could be kept clean from high nitrite/nitrate/ammonium levels so that no water change is needed. The fish waste would provide nutrients and CO2 for the plants, and the plants provide O2 for the fish, in a complement way. Does anyone have a similar setup or know someone who has done it like that? Thanks for any suggestions and your thoughts on this subject. Wayne
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