Fish dying. Not enough oxygen? - The Planted Tank Forum
 
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post #1 of 15 (permalink) Old 08-10-2018, 06:15 PM Thread Starter
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Fish dying. Not enough oxygen?

Hello I did a water change yesterday and today I got home from work and my tank looks a little cloudy. Multiple fish and shrimp are dead. The rest are at the surface. Anyone know what could be going on?? I’m doing an emergency water change now
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post #2 of 15 (permalink) Old 08-10-2018, 06:29 PM
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The cloudy water ( bacterial bloom), is due to the growth of heterotrophic bacteria. When you get a bloom like this it does take the oxygen from the water and create an ammonia spike.

If it is a cycling tank or a "new tank cycle" ( under 3 months) this may have been caused by an insufficient biofilter.
If an established tank, the bacterial bloom is due to too high an organic load for the nitrifying bacteria ( aerobic, autotrophic bacteria) to process; and, in response, the heterotrophic bacteria ( which is both aerobic and anaerobic) builds to process the high load of organics in system. This in turn depletes dissolved oxygen in water and leads to an ammonia spike.
Most of the time when this happens in an established tank it is from either from a filter that is not maintained and cleaned routinely or from organics building up in substrate from overfeeding, dying plant material,and fish waste.

Add more surface oxygen asap by lowering water level and adding airstone!

Is this a newly established cycle or established cycle?


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post #3 of 15 (permalink) Old 08-10-2018, 06:39 PM Thread Starter
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Alright do you think it could be due to removing 90% of my surface plants when I did the water change??? Because I cleaned the filter not too long ago. I turned off my co2 also. Looks like the fish are starting to swim down at the bottom again. The dead one looks bloated or something.
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post #4 of 15 (permalink) Old 08-10-2018, 06:51 PM
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Originally Posted by Stayinblitzed View Post
Alright do you think it could be due to removing 90% of my surface plants when I did the water change??? Because I cleaned the filter not too long ago. I turned off my co2 also. Looks like the fish are starting to swim down at the bottom again. The dead one looks bloated or something.


Possibly, but unlikely.
Did you do water tests?
What is ammonia, nitrIte, nitrAte reading?
How often do you change water?
What kind of filter is it? Do you have mechanical and biological media?
Size tank and occupants ( kind and numbers).

The bloating is what can be expected from organs shutting down in fish from ammonia spike. The ammonia damages gills and then the internal organs of fish do not receive adequate oxygen. Internal organs fail and the abdomen swells.


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post #5 of 15 (permalink) Old 08-10-2018, 07:04 PM Thread Starter
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Haven’t don’t parameter tests yet. My Bolivian rams died, shrimp died, and butterfly loach died. I have neon tetra, runny nose tetra, and some peacock gudgeons left that seem to be doing alright. I do a water change once a week unless there’s a lot of bad build up
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post #6 of 15 (permalink) Old 08-10-2018, 07:31 PM
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I would recommend you read this article---especially the section under cloudy water:

https://www.oscarfish.com/article-ho...-bacteria.html


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post #7 of 15 (permalink) Old 08-10-2018, 09:23 PM Thread Starter
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Thank you for the help
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post #8 of 15 (permalink) Old 08-10-2018, 09:44 PM
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Chloramine, chlorine, temperature shock?


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post #9 of 15 (permalink) Old 08-10-2018, 10:35 PM Thread Starter
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What’s chloramine??? I don’t think it was temperature shock or chlorine since I use the same water every time. When I did a water change today the fish went down again towards the bottom of the tank.
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post #10 of 15 (permalink) Old 08-11-2018, 05:38 AM
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What’s chloramine??? I don’t think it was temperature shock or chlorine since I use the same water every time. When I did a water change today the fish went down again towards the bottom of the tank.
Chloramines are chlorine and ammonia together.

I'd say bacteria bloom for sure. Water change adds oxygen in the water. Get an air stone and treat for bacteria
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post #11 of 15 (permalink) Old 08-11-2018, 06:45 AM
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How much CO2 are you injecting? Seems like the more delicate livestock died while the hardier ones survived. Lack of O2 from a bloom may be enough to cause this, but I'm leaning towards CO2 being your issue (or combination of).
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post #12 of 15 (permalink) Old 09-19-2018, 07:22 PM Thread Starter
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It happened again to me. I woke up and my fish were at the surface. Some died. I have taken everything out and completely cleaned the gravel of the tank. Did that last time too and it was fine for awhile. This time I did the same as last time. Left in the air stone a couple days. Then I tookk it out. The fish were at the surface the next morning
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post #13 of 15 (permalink) Old 09-19-2018, 07:50 PM
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It happened again to me. I woke up and my fish were at the surface. Some died. I have taken everything out and completely cleaned the gravel of the tank. Did that last time too and it was fine for awhile. This time I did the same as last time. Left in the air stone a couple days. Then I took it out. The fish were at the surface the next morning
In an oxygen deficient environment oxygen levels will be highest near the surface and lowest at the bottom. When the fish are swimming near the surface it is generally a good indication of water problems such as low oxygen or toxic water. If you are injecting CO2 into the tank turn the CO2 off when or 1 hour before the lights turn off. Also turning on a air pump every night would help prevent more deaths. I would also increase surface agitation of the water to increase oxygen content.

Note tap water is often sterilized with chlorine or chloramines. If you are using tap water you should treat it to remove chlorine or chloramines from the water. Chloine and Chloramines are toxic to animals.

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It happened again to me. I woke up and my fish were at the surface. Some died. I have taken everything out and completely cleaned the gravel of the tank. Did that last time too and it was fine for awhile. This time I did the same as last time. Left in the air stone a couple days. Then I took it out. The fish were at the surface the next morning
In an oxygen deficient environment oxygen levels will be highest near the surface and lowest at the bottom. When the fish are swimming near the surface it is generally a good indication of water problems such as low oxygen or toxic water. If you are injecting CO2 into the tank turn the CO2 off when or 1 hour before the lights turn off. Also turning on a air pump every night would help prevent more deaths. I would also increase surface agitation of the water to increase oxygen content.

Note tap water is often sterilized with chlorine or chloramines. If you are using tap water you should treat it to remove chlorine or chloramines from the water. Chlorine and Chloramines are toxic to animals.
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post #14 of 15 (permalink) Old 09-19-2018, 08:53 PM Thread Starter
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I don’t believe it is a co2 problem because I have had it off for a few days. Maybe 5 days ago it happened once. Cleaned it out an air supply in. Then three days ago took out the air supply. Didn’t turn the co2 back on yet. The next morning. The fish were at the top again. So I put back in the air supply and haven’t taken it out. The fish will swim all over with it on but that really kills my co2 for my plants
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post #15 of 15 (permalink) Old 09-20-2018, 04:29 AM
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If CO2 is out of the equation, it could be bacterial. I've kept fish in a bucket for a couple weeks with no airstone or surface movement, so I highly doubt it's due to filtration. Something is causing your O2 to drop to dangerous levels, and the only thing I can think of is bacteria.

Something you could try is draining the tank as low as you possibly can, let things dry as much as you can without letting plants dry too much, and then fill it back up. That will help remove a lot of possible issues.
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