I recently received an email from a reader concerning water changes in a small 1 gallon planted aquarium. She was planning on keeping a few Heterandria formosa (tiny live bearing fish, pictured above) and live plants but had some questions about water changes:
But I can't figure out, how often and how much for water changes? Will water changes in this circumstance harm the system more than help it? What do you think?
This got me thinking. Why not write a post on the do's and don'ts of water changes in the planted aquarium? So, here they are:
Do change 30-50% of the aquarium's water every 1-2 weeks. This is variable based on fish load and filtration, but not on the aquarium's size. From 1 gallon to 100 gallons, 30-50% is a good rule of thumb. This removes all the toxins and excess nutrients that build up in the water.
Don't rely on filters to clean the water. Filters don't remove excess nutrients and toxins from the water, they just trap it so it can be removed easier when you clean your filter. However, filters also can't remove many things effectively.
Do make sure the water you use to fill the aquarium back up is the same temperature as the aquarium water. Drastic changes in temperature stress the fish and can lead to disease and even instant death in extreme cases.
Don't forget to add a water conditioner that removes chlorine and/or chloramines if you are using tap water. These can kill fish and even plants if not removed. Water conditioners also often remove heavy metals such as copper that may harm plants and fish.
Do water changes after courses of medication, after stirring up the substrate doing a re-scape, or after accidentally overdosing anything, including fertilizers. Water changes help to "reset" the aquarium by removing dissolved waste and chemicals. They are often a cure-all for many aquarium related problems, and rarely cause harm if done in moderation.
Don't remove more than 50% of the water during a water change if you can help it. Sometimes, more than 50% is needed in extreme cases (such as ammonia spikes or overdoses), but this can put stress on the fish and the beneficial bacteria in the aquarium. It can lead to rapid changes in water parameters (such as pH) that are as stressful to fish as rapid temperature changes.
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6 comments:
Good tips, thanks. I just performed a water change, but only changed about 25% to maybe 30%. I'll change a little more the next time.
to above: 25-30% is sufficient. I tend to think 50% is too much of a shock to your fish, especially in newer tanks.
The beneficial bacterias doesn't live in water, only harmfulones does.Good bacterias live on biofilm on surfaces: subtrate, plants and filter. You dont do any harm to ok-bacterias by waterchange.
-Katinka-
Very insightful... good reminder to experienced hobbyist alike! Keep 'em coming :-)
You CAN hurt your biological filter ( good bacteria )by doing huge water changes +50% often. If you take away all of the food (toxins) it will weaken if not kill of some of the bacteria.
How do you avoid a temperature change when doing the water change? I can't use tap water because we have a water softener. I can use the outside faucets, because they aren't on the softener, but then I can't control the temperature. This is an 80-gallon tank, so that's too much water to heat on the stove.
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