Looking for suggestions for dose of liquid co2 in a 2.5 gallon tank (picture) - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 08-08-2019, 10:25 PM Thread Starter
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Looking for suggestions for dose of liquid co2 in a 2.5 gallon tank (picture)

I just had a slight algae outbreak due to too much lighting (i believe) I am using the fluval cob nano led light and had it on for typically 12 hours with no co2. At least, that's the first thing i'm assuming it is. I cut the light down to 6 hours and haven't seen it increase the last few days. However, I'm trying to grow an s. repens carpet, I know I have the light but growth is slow. I don't want a slow growing tank, I want a lively tank.

I also recently planted some lemon bacopa which you will see is all lopsided as I just planted it. The tank is established at 6 months old with a heavy bioload. (I've been using flourish root tabs and have (but haven't used for long) flourish comprehensive, iron and potassium. I was hoping that before I kind of winged it and risked algae or killing my fish if anybody here had any suggestions on light duration and amount of API CO2 booster to use. (the recommended dose per day on the back of the bottle, adjusted for my tank size is .25ml which is 5 drops.

I do not have a drop checker.
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post #2 of 6 (permalink) Old 08-09-2019, 12:12 AM
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Seachem Excel is your friend
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post #3 of 6 (permalink) Old 08-09-2019, 12:38 AM
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On a regular basis, you can usually do double the doses recommended by the fertilizer companies, e.g.; Seachem Excel. The API CO2 Booster, as I recall, is similar. If you have just begun the dosing, stay with the recommended dosing until you find the sweet spot for your plant growth. However, as far as algaecide capability is concerned, these only impede or kill hair-type algae. What I think I see is mostly GDA, maybe some hair near the top. Your water seems hazy. Is that just the photo? I don't see a filter.

You said you have a heavy bio-load, but I don’t see any fish (is that a fin at the top). Without the bio-load, you likely need to also add NO3 and PO4, as Flourish Comp doesn’t have much. Your root tabs will have some but, if you wish, you can eliminate root tabs in favor of water column dosing only.

You may want to get some test kits, since you are getting serious about plants. I would suggest the Salifert Nitrate, Salifert PO4, and API GH/KH kits as a start. It is important to develop a feel for the macro (NO3, PO4 and K) loadings.

Your light is good at 6 hours. You can start increasing it when you are satisfied with your tank. With any increase in light, you can then start increasing the API CO2 Booster and, you may then find that other ferts will need to go up (watch your test kits).

Incidentally, since you aren’t injecting CO2, you don’t need a drop checker. DC’s are indicators for larger CO2 levels than what will dissolve into your water from the atmosphere (max of 3ppm).
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post #4 of 6 (permalink) Old 08-09-2019, 01:23 AM
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Personally I'd avoid overdosing on excel etc; not to restart the age old debate but the only times I see complaints about it being toxic they're almost immediately followed by "I was double/triple/5x dosing" Start light and then if you think it's going well and needs more, creep it up gently.

(I sincerely hope this doesn't lead to that argument - not at all my intent.)
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post #5 of 6 (permalink) Old 08-09-2019, 02:24 AM Thread Starter
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Quote:
Your water seems hazy.
I just planted in the back within the hour so the water is a little mucked up.

Quote:
I don’t see any fish
I do have 4 guppies in there. small tank I know.

Is the API GH/KH kit and Salifert Nitrate more accurate than the 5-in-1 test strips I currently use? (I also have an ammonia kit)

Thanks for the suggestion. I was only going to start with half the dose with 6 hours of light duration. But if you say double is doable at that light duration that's reassuring. I wasn't sure how easy it would be for me to overdo it with these, or if I had to be really precise depending on how planted my tank was, or simply go off the bottle recommendations for tank size.
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post #6 of 6 (permalink) Old 08-09-2019, 03:40 AM
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Quote:
Originally Posted by nothreat33 View Post
I just planted in the back within the hour so the water is a little mucked up.



I do have 4 guppies in there. small tank I know.

Is the API GH/KH kit and Salifert Nitrate more accurate than the 5-in-1 test strips I currently use? (I also have an ammonia kit)

Thanks for the suggestion. I was only going to start with half the dose with 6 hours of light duration. But if you say double is doable at that light duration that's reassuring. I wasn't sure how easy it would be for me to overdo it with these, or if I had to be really precise depending on how planted my tank was, or simply go off the bottle recommendations for tank size.
Test strips only provide an approximation and are the least reliable of the tests that are available. The reagent teats are far more accurate. Next step up in accuracy, beyond reagent kits, is far more expensive.
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