New to Pressurized CO2, fish question - The Planted Tank Forum
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post #1 of 19 (permalink) Old 03-29-2009, 02:49 PM Thread Starter
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New to Pressurized CO2, fish question

This morning my angels in my 120 (planted, pressurized co2 tank)
were all grouped and near the bottom left corner. They were all "finning" a bit more than they should. But my school or Rummynose are happy as can be.

Could this be to much co2?


I changed out about 15 gallons, tested and my Nitrate is a bit high (I can never seem to get it down)
I shut off the co2 (I run for about 4-5 hours per day at about 3-4 bps)

I have been slowly lowering the temp as I was on the high side with the addition of my new lighting.


I guess I am just trying to 'trouble shoot' the possible problems. With so many variables I am looking for advice please.


What should Nitrate be at in the "best of all possible worlds"?


thank you

Brad Sherwood North Dakota
55 planted-tetras and RC shrimp
125 C02 planted tank,Angels,various tetra's, clownloaches.
72 bow front- koi tank in the winter...
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post #2 of 19 (permalink) Old 03-29-2009, 02:50 PM Thread Starter
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All water changes are done with RO water.

Brad Sherwood North Dakota
55 planted-tetras and RC shrimp
125 C02 planted tank,Angels,various tetra's, clownloaches.
72 bow front- koi tank in the winter...
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post #3 of 19 (permalink) Old 03-29-2009, 04:09 PM
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Brad, I have a few questions....one is what exactly does your nitrate test at? Also, do you test for nitrite and ammonia, and if you do, what are those readings? Also, pH?
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post #4 of 19 (permalink) Old 03-29-2009, 06:08 PM Thread Starter
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PH is about 6.5 (reading on the test strips so accuracy is not exact)
Nitrite is 0
Nitrate is 30-40
I don't currently test for ammonia..

Brad Sherwood North Dakota
55 planted-tetras and RC shrimp
125 C02 planted tank,Angels,various tetra's, clownloaches.
72 bow front- koi tank in the winter...
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post #5 of 19 (permalink) Old 03-29-2009, 06:10 PM Thread Starter
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fish are fine right now...no longer "finning".

Brad Sherwood North Dakota
55 planted-tetras and RC shrimp
125 C02 planted tank,Angels,various tetra's, clownloaches.
72 bow front- koi tank in the winter...
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post #6 of 19 (permalink) Old 03-29-2009, 06:16 PM
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do you shut your CO2 off at night? Either way, you may want to aerate at night.

John



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post #7 of 19 (permalink) Old 03-29-2009, 06:48 PM Thread Starter
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Co2 goes off at night.
I could easily aerate at night ...the tank is pretty heavily planted I thought that would provide plenty of Oxygen

Brad Sherwood North Dakota
55 planted-tetras and RC shrimp
125 C02 planted tank,Angels,various tetra's, clownloaches.
72 bow front- koi tank in the winter...
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post #8 of 19 (permalink) Old 03-30-2009, 12:30 AM
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Plants to not produce oxygen at night/without light.

What is the temp or the highest temp which the tank gets to normally?
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post #9 of 19 (permalink) Old 03-30-2009, 01:23 AM
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Quote:
Originally Posted by fishdweeb View Post
This morning my angels in my 120 (planted, pressurized co2 tank)
were all grouped and near the bottom left corner. They were all "finning" a bit more than they should. But my school or Rummynose are happy as can be.

Could this be to much co2?


I changed out about 15 gallons, tested and my Nitrate is a bit high (I can never seem to get it down)
I shut off the co2 (I run for about 4-5 hours per day at about 3-4 bps)

I have been slowly lowering the temp as I was on the high side with the addition of my new lighting.


I guess I am just trying to 'trouble shoot' the possible problems. With so many variables I am looking for advice please.


What should Nitrate be at in the "best of all possible worlds"?


thank you
Too much CO2 will have your fish gasping at the surface. Most fish are pretty tolerant of higher nitrate levels. I have a question. Why do you run CO2 for only 4-5 hours a day? You should run it for as long as your lights are on. Fish can tolerate higher CO2 in the water as well. But IMO they have to be acclimated to it slowly. Are you dosing macro fertilizers? If you want to lower nitrate make sure you have enough CO2, K,P and traces-the plants will remove it!


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post #10 of 19 (permalink) Old 03-30-2009, 01:54 AM Thread Starter
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Temp gets to 80 as angels like it a bit warm.
I will up the co2 time
I am dosing with ferts...

Brad Sherwood North Dakota
55 planted-tetras and RC shrimp
125 C02 planted tank,Angels,various tetra's, clownloaches.
72 bow front- koi tank in the winter...
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post #11 of 19 (permalink) Old 03-30-2009, 02:15 AM
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Depending on what your dosing 20% may not be enough to reset the tank each week on the water changes.


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post #12 of 19 (permalink) Old 03-30-2009, 02:26 AM
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I'm just posting what I've got and run. My water is crap so I start with RO and build back. Tank temp runs 78 - 82f depending on room temp.
5-6 dGH, 8 dKH, CO2 controls PH @ 6.8 - 7.0 running on a controller. With 50% weekly water changes I have to dose to get KNO3 up to around 15-20. There's a power head with a sponge on it to increase circulation. One of my 75g tanks is over stocked with 8 young adult veils and no air added even at night no issues. Set up since last May this way.


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post #13 of 19 (permalink) Old 04-01-2009, 01:58 PM
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Quote:
Originally Posted by fishdweeb View Post
PH is about 6.5 (reading on the test strips so accuracy is not exact)
Nitrite is 0
Nitrate is 30-40
I don't currently test for ammonia..

If I were you I would through the test strips away and go out and buy a drop test kit. I use the tetra test kit with all you need for $20. Its lasts about 2 months.

"For England James?"
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post #14 of 19 (permalink) Old 04-01-2009, 07:47 PM
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Bubbles differ in size to a degree, but in a 120 3-4 bps generally will not be enough to bother fish, in fact plants may need more depending on light. I run 6 or thereabouts (hard to count at that rate) with no issues at all in a 90G, I could even go more really. Aslo, generally speaking again, when fish are struggling due to CO2 they'll hang at the top of the tank gasping at the surface. I doubt your angels are stressing from CO2. HTH!

I believe my stance on this issue to be perfectly ambiguous and illdefined and I see no reason to elaborate further.
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post #15 of 19 (permalink) Old 04-02-2009, 02:43 AM
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My bubble rate is too high to count but I do have it on a controller which is set for 6.5. The ph in the am before lights/CO2 on is 7.1. I run the count high because it takes quite a while to reach my target. Probably due to wet-dry trickle filter and overflow combination. This is 55g btw. As a side note: since cranking up the CO2 algae is on the run!


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