Co2 Drop

Kevinb

New Member
Dec 8, 2019
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1
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46
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I could use a little help in determining my co2 dosage.
Kh =4
24 hr degassed sample =7.9
Late day ph (just before co2 shuts down for The day) = 6.2-6.3 for the last two days.

fish seem fine, one Amano shrimp was swimming around the tank purposelessly when ph was as low as 6.2, but fish acting ok with good coloration.

Looking at the kh/ph chart, my theoretical ph target would be in the neighborhood of 6.6 at the lowest. I trust the ph readings from my Hanna prep+; I calibrate it daily while honing in on my co2 rate.

I have good surface agitation with Eheim canister filter (Venturi style flow outlet). I also have an Eheim surface skimmer that runs 24/7.

I did recently add Amano shrimp and to ensure they don’t get out, I covered up the tank hood completely with the little plastic strips enclosing the top pretty well. I was pushing co2 down to 6.5 at most without the complete cover. I am lead to believe that completely sealing up the top has affected my degassing abilities.

I am in the midst of a hair algae battle and with the “slow - over 3 week” titration of co2. My fast growing plants are taking off, but the other few are struggling with algae cover. I have been doing 50% water changes twice per week.
Ammonia = 0
Nitrites = 0
Nitrates = Corrected = 5 ppm

in leu of my algae battle, I am tempted to remain where I am with co2. Is this a mistake? Should I decrease due to the clue from the one Amano shrimp of the 9 others I have?

I also have a good fish bioload but not overload.

for lighting I have the fluval planted with 5 hours of 80% max lighting with 3 hour sunrise (ramp up) and 3 hours sunset (ramp down). Also running a finnex 24/7 planted running on for 4-5 hours, no ramp up/down.

macros- pps dosing currently.
Micros- flourish comprehensive and flourish trace. Bottle calls for 5mls twice a week for each.

I can elaborate on any of the above if it helps.
 
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Phishless

Lifetime Member
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Jul 13, 2017
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Typically a 1.0pH drop is adequate, if you can get away with more great.
Ditch the chart and lower KH if possible.

Zero NO3 would be of concern to me.
This most likely means that K & PO4 are near zero too.

With CO2 & adequate lighting Comp & Trace may need to be upped.
Using your present dosing what is the total ppm of Fe being dosed?

Would shorten the photo period in some way.
I run 6.5 hours peak with a 15min ramp up & down.
 

Kevinb

New Member
Dec 8, 2019
8
1
3
46
Ny
Phishless,

0.032% on the bottle.
I dose 10ml per week
Trying to figure out ppm

How would I go about lowering KH? Is this where I would fork over more cash for RO? Ha

and as far as nitrates go, i am at 5 ppm currently. I looked over testing instructions and it was user operator error.
 
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Phishless

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Jul 13, 2017
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RB calculator @ bottom of this page can be used or Zorfox calculator on web.

In 75G tank 10ml comp provides these ppm

B 0.0237753
Ca 0.369838
Cl 3.037955
Co 0.00105668
Cu 0.00026417
Fe 0.845344
K 0.8110019
K2O 0.977429
Mg 0.290587
Mn 0.03117206
Mo 0.00237753
N 0.184919
Na 0.343421
NO3 0.8136436
P 0.01162348
P2O5 0.026417
PO4 0.0343421
S 0.73254341
Zn 0.00184919

10ml Trace provides

B 0.00739676
Co 0.000079251
Cu 0.00845344
Mn 0.02245445
Mo 0.00079251
Ni 0.000007925
Rb 0.000021134
V 0.000005283
Zn 0.04464473

HCl can be used to drop KH but drop slowly.
 

Kevinb

New Member
Dec 8, 2019
8
1
3
46
Ny
Thanks so much phishless! I started supplementing 5ml dose of seachem iron (1%) along with my current regimen. I believe I should be shooting for 0.5 ppm. I can get a tester, but with 50% weekly water changes AND new dosing I should be there. Along with watching for new growth leaf color.

I set light for 6.5 hours on which includes a short ramp up/down.

trimmed many but not all leaves/stems with algae, and 50% water changes 1-2x week.

I lowered blue spectrum light to 7%. I don’t know yet if this has any merit, but can high blue levels promote algae growth in an unbalanced tank?

I have to say, the 9 Amano shrimp I have are doing their part keeping hair algae off the large piece of driftwood in the tank. This is predominantly where the hair algae takes hold. My amano’s live on the underside of the piece and come out mainly at night to devour most of the growth that comes up from the day. The driftwood angles up from the bottom corner of the tank to top center, and being 4-6 inches from the light it just breeds algae on the log.