Just wiped out a tank of fish - Equipment - Aquatic Plant Central

Go Back   Aquatic Plant Central > General Interest Forums > Equipment

Equipment Aquarium Equipment - Discuss equipment to help setup your planted aquarium.

Reply
 
LinkBack Thread Tools Display Modes
Old 03-24-2007, 02:59 PM   #1 (permalink)
Member
 
benjavan's Avatar
 
Join Date: Dec 2006
Location: Grand Rapids Michigan
Posts: 48
iTrader Ratings: 0
benjavan is a regular member
Default Just wiped out a tank of fish

I have been following the sometimes heated debate on wether or not to run a CO2 system at night or to supliment O2 with an airstone or powerhead at night and wether or not we are putting our fish at risk. I realize that in a well balanced tank with everything running smoothly, a CO2 system running at night should not deplete O2 levels to a dangerous level or cause a major fluctuation in pH.

But, what if something goes wrong? I have a beautifuly planted 55g tank that had, I emphasize had, a great little population of micro and dwarf rasboras. It was filtered by a HOT magnum. Thursday night we had some storms go through and lost power for about an hour. The HOT magnum decided not to fire back up. Today, I found most of my cool little fish floating with a few staglers gasping for their final breaths. I may save 4 out of about 12 of the fish.

A small air pump with an airstone and a timer could have prevented this tradjedy. It also would have been much cheaper than replacing the fish.
benjavan is offline   Reply With Quote

Advertisement [Remove Advertisement]
Old 03-24-2007, 03:36 PM   #2 (permalink)
Senior Member
 
DonaldmBoyer's Avatar
 
Join Date: Aug 2005
Location: Hendersonville, TN
Posts: 2,073
iTrader Ratings: 45
iTrader Positive Rating: 100%
DonaldmBoyer is a regular member
Default Re: Just wiped out a tank of fish

Sorry to hear that! It's why I never run my CO2 at night because if the plants can't metabolize the carbon in the water, the CO2 turns into carbonic acid using the hydrogen and oxygen from the H2O.

Ahh....live and learn, man! We have all experienced a catastrophe every now and again. I accidently electrocuted all the fish in one of my tanks when a light fell into it....long story. And that was a marine tank, so the fish were all above $20!

Salvage what you can, and at least you still have your plants! But that sucks!
DonaldmBoyer is offline   Reply With Quote
Old 03-24-2007, 05:24 PM   #3 (permalink)
 
Join Date: Jan 2004
Posts: 439
iTrader Ratings: 2
iTrader Positive Rating: 100%
Rex Grigg is a regular member
Default Re: Just wiped out a tank of fish

The CO2 turns into carbonic acid no matter what. That's why the pH lowers.

And I would hazard a guess that the fish did not die due to CO2 but lack of O2 caused by the failure of the filter to restart. With out the water movement the water went stagnant and you lost the gas exchange at the surface.

CO2 doesn't deplete O2, not at night, not during the day, not at any time.
Rex Grigg is offline   Reply With Quote
 
Old 03-24-2007, 07:00 PM   #4 (permalink)
Senior Member
 
Join Date: Feb 2007
Posts: 557
iTrader Ratings: 0
furballi is a regular member
Default Re: Just wiped out a tank of fish

Another reason not to OD with CO2 injection. 15 to 20 pmm should be more than adequate for many tanks. For best performance, the CO2 should be added to the intake of the filter. If the filter stops, then the CO2 level in the tank will also stop due to the lack of water circulation. Too much CO2 will cause a significant drop in pH when working with low KH water. This can kill fish.

If the tank is NOT OVERSTOCKED, then the top surface area of the tank should provide adequate means for the exchange of O2. An experience aquarist will never allow the tank's water chemistry to go hay-wire during a power blackout. Remember, a good tank should not rely on filter and airstone to keep the livestock healthy.

Since you only have 12 fish in a 55 gal tank, O2 depletion should not be an issue. I've kept 40 cardinals, neons, and otos in a 50 gal for 3/4 day without the benefit of filter/pump/airstone.
furballi is offline   Reply With Quote
Old 03-24-2007, 09:38 PM   #5 (permalink)
 
Join Date: Mar 2006
Posts: 548
iTrader Ratings: 6
iTrader Positive Rating: 100%
247Plants is a regular member
Default Re: Just wiped out a tank of fish

If you run a solenoid on your set up it will cut off when the power goes out automatically....
247Plants is offline   Reply With Quote
Old 03-25-2007, 04:02 AM   #6 (permalink)
 
Join Date: Jan 2004
Posts: 439
iTrader Ratings: 2
iTrader Positive Rating: 100%
Rex Grigg is a regular member
Default Re: Just wiped out a tank of fish

Sorry furballi. You fell into the trap. Low pH caused by CO2 doesn't kill fish. And kH has nothing to do with it either. Many people are running tanks with pressurized CO2 injection with low kH water.

High levels of CO2 in an aquarium make it impossible for the gills of the fish to do the CO2/O2 exchange. This is what kills fish. Not the low pH.

Low pH is the symptom and not the problem.
Rex Grigg is offline   Reply With Quote
Old 03-25-2007, 07:30 AM   #7 (permalink)
Senior Member
 
Join Date: Feb 2007
Posts: 557
iTrader Ratings: 0
furballi is a regular member
Default Re: Just wiped out a tank of fish

"Too much CO2 will cause a significant drop in pH when working with low KH water. This can kill fish." What part of that statement is unclear? If the pH drops from 7 to sub 5 in 15 minutes (high level of carbonic acid in water with very low buffering capability or KH), then this alone can affect weak fish. Anabantoids can extract oxygen directly from the air, but they are still susceptible to a very sharp drop in pH! Plus, we all know that the concentration of CO2 in air is MUCH higher than water.
furballi is offline   Reply With Quote
Old 03-25-2007, 08:13 AM   #8 (permalink)
 
Join Date: Oct 2006
Posts: 55
iTrader Ratings: 0
Ulan is a regular member
Default Re: Just wiped out a tank of fish

I'd assume that too much CO2 will build up a layer of CO2 on top of the water (CO2 is heavier than air), especially in those cases where you have a lid or a significant rim above the water line. This will invert the partial pressures of O2 and CO2 dramatically and lead to a situation where you will actually have more dissolved CO2 in the water than O2. And your poor anabantoid will also gulp down CO2 when he tries to get some oxygen from above the water surface.
Ulan is offline   Reply With Quote
Old 03-25-2007, 09:10 AM   #9 (permalink)
 
Join Date: Mar 2004
Posts: 119
iTrader Ratings: 0
Tonka is a regular member
Default Re: Just wiped out a tank of fish

Anybody else eagerly anticipating Rex's response to Furballi?
Tonka is offline   Reply With Quote
Old 03-25-2007, 09:34 AM   #10 (permalink)
Senior Member
 
snowhillbilly's Avatar
 
Join Date: Mar 2006
Location: Jamestown,ND
Posts: 432
iTrader Ratings: 38
iTrader Positive Rating: 100%
snowhillbilly is a regular member
Default Re: Just wiped out a tank of fish

Im awaiting.. LOL furballi sure knows alot about this stuff. I wish I new more about him. Can furballi be trusted as a great word of wisdom here?
snowhillbilly is offline   Reply With Quote
Reply


Aquatic Plant Central > General Interest Forums > Equipment > Just wiped out a tank of fish

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Aquatic Plant Forum Replies Last Post
Fish for a New Tank Left Coast DJ Fish for the Planted Aquarium 5 03-15-2007 04:24 PM
Fish for a 5.5 Tank baka Fish for the Planted Aquarium 3 01-17-2007 03:17 PM
The fish in your planted tank JanS Fish for the Planted Aquarium 14 03-21-2006 05:43 AM
Using mulm from a fish only tank Ashly Scott Substrates 2 12-29-2005 03:06 PM
[Wet Thumb Forum]-Fish tank/Planted tank? jaybird002 El Natural 2 10-14-2005 07:27 AM


All times are GMT -8. The time now is 02:49 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

Search Engine Friendly URLs by vBSEO 3.6.1