is there a limit to water changes? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 11 Old 02-03-2009, 08:18 AM Thread Starter
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Post is there a limit to water changes?

I was just wondering, is there a percentage of water that you shouldn't go over when changing the water. If so what is it
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post #2 of 11 Old 02-03-2009, 08:53 AM
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I know of people who breed and raise Discus who perform daily 50 to 80 percent water changes due in large part to numbers of fish and foods that are fed. On the other end of the spectrum, some folks perform their water changes once a month or every two months depending on stocking and or live plants in the tank. Most seem to agree that 20 percent weekly water changes will be beneficial to the fish by removing dissolved organics and helping to maintain stability.

The most important medication in your fish medicine cabinet is.. Clean water.
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post #3 of 11 Old 02-03-2009, 09:03 AM
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There's no real limit. So long as the water is the proper pH and temperature and conditioned for chlorine or chloramine, you can change as much as you want. The only thing I wouldn't do is a 100% water change. Personally I think if you're doing more than a 50% water change it's better broken up into multiple smaller water changes but that's just me.

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post #4 of 11 Old 02-03-2009, 10:17 AM
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the danger of larger WC is that you risk the chance of losing benificial bacteria in the water. and you really dont want to do that. youd basically be uncycling your tank, for lack of a better explanation. unless you have a massive bio-filtration system or bac house, i would stay away from large WC.
average is about 25-30% wc weekly, and if you arent overfeeding, that should be more then enough.
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post #5 of 11 Old 02-03-2009, 10:19 AM
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The water doesn't contain the beneficial bacteria. The bacteria colonize the surfaces in the tank, gravel, decorations, and the filter media especially. You can't uncycle a tank with a water change.

Well, you can do a 100% water change. Let it sit long enough for all the surfaces to dry out and kill the bacteria that way I suppose.

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post #6 of 11 Old 02-03-2009, 10:40 AM
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One must also remember that not only are you removing dissolved organic compounds during water changes, but you are replacing vital minerals such as calcium and magnesium that have been used up by the fish and need to be replaced regularly for fish to remain healthy. Regular WEEKLY water changes with proper dechlorinator and with new water close to temp of the tank is possibly the best insurance that fish will remain healthy. Assuming you started with healthy fish, the fish are not overfed or over stocked, and that these fish are compatible with each other .

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post #7 of 11 Old 02-04-2009, 02:05 PM Thread Starter
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I do 30% water changes every Saturday and Wednesday. 10 gal tank 16 adult fish. Is that ok?
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post #8 of 11 Old 02-04-2009, 08:13 PM
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50% water changes every other day is the max I would recommend for any tank in emergencies. Water does need to be the correct temp and ph though.

55 Gallon

-10x Zebra Danio
-3x Angelfish
-5x Velvet Red Swordtail
-3x Albino Cory Cat
-3x Clown Loach
-3x Black Mollie
-1x Red Tailed Shark
-1x General Pleco
-1x Snail

10 Gallon

Quarantine

37 Gallon (Wanted)

Not Sure

150 Gallon (Wanted)

-5x Bala Shark
-2x Neon Blue Goarami
-5x Clown Loach
-1x Black Knife Ghost
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post #9 of 11 Old 02-04-2009, 08:13 PM
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Quote:
Originally Posted by zachary4311 View Post
I do 30% water changes every Saturday and Wednesday. 10 gal tank 16 adult fish. Is that ok?
That sounds like a good routine, and even 30% weekly I believe would be fine.

55 Gallon

-10x Zebra Danio
-3x Angelfish
-5x Velvet Red Swordtail
-3x Albino Cory Cat
-3x Clown Loach
-3x Black Mollie
-1x Red Tailed Shark
-1x General Pleco
-1x Snail

10 Gallon

Quarantine

37 Gallon (Wanted)

Not Sure

150 Gallon (Wanted)

-5x Bala Shark
-2x Neon Blue Goarami
-5x Clown Loach
-1x Black Knife Ghost
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post #10 of 11 Old 02-05-2009, 07:39 AM
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Quote:
Originally Posted by zachary4311 View Post
I do 30% water changes every Saturday and Wednesday. 10 gal tank 16 adult fish. Is that ok?
I do 30% weekly... sort of on my 48 gallon. Two 30% changes a week is no problem. I do about that to my betta tank, more if I'm bored at work.

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