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what does high alkalinity and pH do to fish?


tubasavy

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We were just given a fish tank last week from my husband's sister. The fish fared better than I thought, but my water test strips say that my pH is around 7.8 and that my alkalinity is high, at least 300ppm. My other exsisting tank has very hard water because I live in Utah :) I have the test strips to check what is in the water, but now I haven't the faintest idea what to do, or if it matters. Any help would be wonderful!

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We used tap water that was treated and sat before being put in the tank. The way they transported the fish was by putting them in a large pitcher with their own tank water. Because all of the tank water was new I left the old (disgusting!) filter in for the first few days so all the good old bacteria could grow, and when I finally added the last fish (I did it over a short period of time) I added all the old tank water the fish came in. I'm not sure what all the fish are but there is one HUGE placastamous(sp?), 3 neons, 1 silver dollar, some fancy tailed guppy, and 3 others. It was a well established tank before it was moved. My In-laws (where the tank was) live about 30 min north of us, but definately at a higher elevation.

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I would check your tap water compared to the water in the tank now and if the tap water was a lower pH then do a partial water change, but I wouldn't be too concerned unless your fish are showing signs of stress, like raggy fins, cos some fish do like pH a bit higher than others.

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What does high alkalinity to to fish?

Well pH 14 (top end) is oven and drain cleaner, so not many fish would survive that. 7 is neutral, most fish can handle it a degree either side with no problems. South American fish come from very acidic waters, I think it's pH 3-4 because of all the peat in the water.

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