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My 75gl is crashing, again. :-(

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My 75gl is crashing, again. :-(
Old 02-13-2011, 09:34 PM   #11
 
Well you said that once you added an air stone into the tank and lowered the water level so the filter could add O2 as well the fish were fine right? So why not just add an air stone or two in the tank to ensure that you have enough oxygen in the water?
Just my two cents :)
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Old 02-13-2011, 09:39 PM   #12
 
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Quote:
Originally Posted by DKRST View Post
I'm totally hypothesizing here, not knowing your tank info, but if the tank is heavily planted and you did a late afternoon(?) water change, could it be a combination of high dissolved CO2/low O2 in the source water, and the plants pulling O2 from the water at night? Does the filter actually disturb the surface tension normally and how might your filter/plant setup differ from your other tanks?

For what it's worth, municipal water systems are mandated to keep the pH within a couple of tenths of neutral pH, based on conversations I've had with water system employees, assuming you don't have a well.

David
So, 1077 recommended to me awhile back (the first time this happened) to store the water 24 hours prior to using it, agitating it to release CO2. 1077, if you're reading this you are allowed to smack me on the head, this one time only, please.
Storing water isn't feasible for me so what do you think of this idea:

Perform the water changes only in the am, keep the airstone running the entire day. Would this offset the CO2, bringing it to a manageble level for the fish come evening? It's really hard to sleep in my room with that pump running. If I have to I will, but I'd rather not.
(I have a powerhead on order, I just haven't received it yet.)
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Old 02-13-2011, 09:39 PM   #13
 
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That information you found is correct and the more heavily planted, the bigger the potential nighttime O2 deficit. How heavily is the tank stocked?
Sorry - I probably could have saved you some time looking up the aquatic plant respiration info if I'd told you that I have a PhD. in Biology (although I'm not an aquatic biologist)

David
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Old 02-13-2011, 09:40 PM   #14
 
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Quote:
Originally Posted by Blabomb View Post
Well you said that once you added an air stone into the tank and lowered the water level so the filter could add O2 as well the fish were fine right? So why not just add an air stone or two in the tank to ensure that you have enough oxygen in the water?
Just my two cents :)
Ha! We posted at nearly the same time, good thinking! The fish returned to fine almost immediately once the air stone and lowered water happened. I really need to receive that backordered power head.
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Old 02-13-2011, 09:49 PM   #15
 
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Originally Posted by aunt kymmie View Post
Ha! We posted at nearly the same time, good thinking! The fish returned to fine almost immediately once the air stone and lowered water happened. I really need to receive that backordered power head.
Careful with the powerhead, if it doesn't disturb the surface, it won't address the problem of getting CO2 out and, in this particular case, the O2 in! The other issue is, if you want maximum plant happiness, it seems you don't want to drive off too much CO2. I'm circumventing that issue by using Flourish Excel, but it's not the cheapest way to get carbon into the fish tank based on my admittedly limited aquarium expertise!

Last edited by DKRST; 02-13-2011 at 09:51 PM..
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Old 02-13-2011, 09:50 PM   #16
 
Yes we did! haha. But from what you have told us the problem seems to be lack of oxygen. And instead of getting into all that complicated CO2 stuff explained ^^^, the simple solution to me seems to add an air stone or two :)
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Old 02-13-2011, 10:00 PM   #17
 
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Originally Posted by DKRST View Post
Careful with the powerhead, if it doesn't disturb the surface, it won't address the problem of getting CO2 out and, in this particular case, the O2 in! The other issue is, if you want maximum plant happiness, it seems you don't want to drive off too much CO2. I'm circumventing that issue by using Flourish Excel, but it's not the cheapest way to get carbon into the fish tank based on my admittedly limited aquarium expertise!
I'm going to use it the same way 1077 does, gentle movement at the water's surface. His planted tank is doing great. I want maximum plant happiness, but the fish come first! I use Flourish Comprehensive. I used Excel at one time but found it added a new problem for me to deal with: algae breakout, big time! I have a 2 liter bottle of Excel on hand, pay postage and it's yours, for the CO2/O2 lesson.
It's always great to learn new things so you can understand what the heck is happening in your tank.
David, a Ph.d in biology?? That's awesome. I'm envious.

Blabomb- I will run the airstone at water change time, it seems as if that'll be essentially like storing it in a barrel for 24 hours, at least I hope so. If I run the air stone only 24 hours it'll keep my plants happy the six other days between changes. Good plan??
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Old 02-13-2011, 11:07 PM   #18
 
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Sounds like a plan, Kym. It seems the problem only happened during the night after your water change. Hopefully the power head and airstone will solve the problem by getting more O2 into the water during the dark hours.
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Old 02-14-2011, 12:06 AM   #19
 
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Quote:
Originally Posted by aunt kymmie View Post
So, 1077 recommended to me awhile back (the first time this happened) to store the water 24 hours prior to using it, agitating it to release CO2. 1077, if you're reading this you are allowed to smack me on the head, this one time only, please.
Storing water isn't feasible for me so what do you think of this idea:

Perform the water changes only in the am, keep the airstone running the entire day. Would this offset the CO2, bringing it to a manageble level for the fish come evening? It's really hard to sleep in my room with that pump running. If I have to I will, but I'd rather not.
(I have a powerhead on order, I just haven't received it yet.)
Yes, I would try performing water changes in the A.M. and once the powerhead arrives (they are near silent) ,aim it so that the surface isn't broken by the flow from the powerhead, but a rippling effect is created.
Fish react same way when too much CO2 is suddenly added. They will rise to the surface where oxygen and CO2 exchange takes place in an effort to expel CO2 and receive oxygen.By changing water near the end of the photo period for plant's( P.M.) plant's begin using oxygen,, and excess CO2 from water change,fish respiration,and bacterial activity,,,oxygen could be lower than it would be if you changed water in the morning when plant's are producing Oxygen all day and using up CO2 during photosynthesis.
Would also remove nozzle when changing water and just let the water run from the end of the hose rather than spraying into the tank, spray effect may be increasing CO2, and plant's using up oxygen instead of producing it like they do during the day,,could be contributing to excess CO2 and low oxygen condition.In any event, running the powerhead (see my tank) should help with CO2 /oxygen exchange at the surface during evening and performing water changes in the A.M. may also help.
Getting the right rippling effect so as not to drive off CO2 during the day with the powerhead is simply a matter of raising the spray bar up or down,and or keeping water levels in the tank at proper level.
Could also place the powerhead on a timer so that it only runs of an evening but I rum mine all day with little negative effects on plant's and fishes.
Hope this helps.

P.S. Would not run airstone all day, plant's should produce plenty of Oxygen during the day.
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Old 02-14-2011, 12:32 AM   #20
 
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Wow ... ok I am going to give my newb opinion.
I had a similar issue in my 125.... fish gasping in the am. I too scoured the web and learned that while plants produce O2 while the lights are on.... they actually consume it and produce CO2 at night. I am injecting CO2 and have it set to come on a half hour after the lights and go off a falf hour before the lights go off. I have also setup an air pump that comes on in the evening with my blue LEDs.
Since setting up the pump, I have had NO issues.
I hope you find a system that works for you
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