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Old 05-30-2013, 08:34 PM   #11
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Quote:
Originally Posted by f1shg33kz
I don't think large water changes are an issue. Discus keepers routinely do 95% water changes and Discus are some very sensitive fish. I've been doing 50% or larger water changes for years without issues, I find that it helps with spawning in many species. If something induces spawning, I don't think that it is really all that stressful.

The OP said the fish died while the tank was still being vacuumed, It is far more likely the fish either had a pre-existing condition that was not externally detectable or some kind of contaminant got in to the water.
I agree, the culprit is probably a contaminant or something already wrong with the fish. Or maybe some sudden movement stressed them out bad enough to kill them. Or maybe it was just bad timing - they may have died at that very moment whether you had done a water change then or not.

I also agree that there is nothing wrong with large water changes. I do huge changes weekly on all of my freshwater tanks and have never had a problem. My 56 gets a nearly 90% change a week, simply because I feel like I am wasting prime if I don't change a lot of water since with the python style water changer I use I have to dose for the whole tank anyway. So I change almost the whole water volume. Keeps my water pristine and no fish have ever died because I did a big water change.
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Old 05-30-2013, 09:36 PM   #12
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Thanks for all the responses! I also use Prime whenever I am doing a water change. I do hear many different opinions about how much to change at once. I've been doing a 50-75% change weekly for months and I haven't lost any fish. Actually, the fish all seem to be a little bit more active after a change. The good news is that everyone is looking healthy and doing fine! I will definitely be much more careful with moving things in the tank during a pwc. Maybe this is a sully question, but do you guys usually vacuum under rocks and driftwood or just go around it?
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Old 05-30-2013, 10:01 PM   #13
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It's good to vacuum under decor every once in a while. Waste can build up underneath them.
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Old 05-30-2013, 10:05 PM   #14
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I get underneath the rocks and wood when I vacuum and once every couple months I pull all the decor out of the tank and vacuum where it all was. I have some serious poop machine plecos and the poop gets under everything. So from time to time the sand needs a really good cleaning.
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Old 06-01-2013, 03:14 AM   #15
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Some of the other members have had a similar problem, and I had an encounter like it as well. Where - as you mentioned before, soon after a water change a fish ends up dead. For some the fish seems to be acting erratically, or just simply lay on the bottom or top dead soon after.
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Old 06-01-2013, 03:24 AM   #16
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My tank is stocked to the max and I don't do that hefty of a water change. I have a great filter that helps with keeping my water clean. I wouldn't do 75% a week. I would do 35. As long as you have good circulating and plenty of oxygen in the water you should be fine. I have had my tank for almost 2 years with over 20+ fish with some Horny cray that keep multiplying and a turtle. I have only lost 2 fish since my tank had been fully established.
What size tank do you have? And what size fish?
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Old 06-01-2013, 07:41 AM   #17
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I have a 55 with 6 rainbows, 6 harlequin rasboras, 6 pristella tetras, 6 cardinals, a bristlenose, and 6 cories. The fish are all pretty small except for the rainbows and pleco. It is a little overstocked (found aquadvisor a little too late:/) but these are the first deaths I've had and I haven't added fish for months
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