how long would a 500mL bottle of seachem excel last?
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Old 08-18-2010, 07:32 PM   #1
fishykid1
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how long would a 500mL bottle of seachem excel last?


I have a 20G hightech and 10G low tech and was planning to dose excel to help the growth. How long do you think the bottle would last if dosing twice per week?
?
4 months? 6 months
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Old 08-18-2010, 08:13 PM   #2
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The recommended dose is 1ml per 10g, dosed daily. So for both your tanks, that would be 3ml/day. 500ml / 3ml = 166 days, or about 5 1/2 months.

The daily doses are preferred since Excel only lasts about a day in the aquarium anyway.
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Old 08-18-2010, 08:33 PM   #3
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The 165 days would be reduced by the number of water changes you do during that time. If you change 50% of the water every week you would dose 5X at each change, or 15 ml each time. So one weeks total dosage would be 15 plus 3x6 or 33 ml per week. 500 divided by 33 is 15.15 weeks or 106 days, 3 1/3 months.
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Old 08-18-2010, 10:56 PM   #4
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Some people, myself included, never use the 5X dose though. It's of questionable usefulness since it'll be gone in a day anyway; and since Excel is toxic at higher doses, I prefer to play it safe.

Actually, I just switched over to Metricide. If I use normal daily doses on all my aquariums (total 84g), it'll last me 2.5 years. Not bad for $25.
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Old 08-19-2010, 01:17 AM   #5
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where can you get metricide? I've heard of it, never seen it. I'm also going to get a 500mL bottle of seachem iron. that should be in a lot smaller doses.

Even in hightech tanks doesn't excel help some? I've heard that many times. I probably would stick to just the 1mL per 10G daily. and not really worry about water changes since 1 tank is low tech and the other has injected co2 at 30 ppm
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Old 08-19-2010, 02:29 AM   #6
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Are you using it to supplement the CO2 you're already injecting or for the nutrients? If you're injecting and have it at the 30ppm, then it won't provide any really noticeable additional benefit as far as CO2.
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Old 08-19-2010, 06:29 AM   #7
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Metricide 14-Day 1 Gallon is available at Dealmed.com for $17.15, comes out to about $25 with shipping. If you get it, throw out the separate small bottle of activator. Metricide 14-Day is 2.6% Glutaraldehyde, and Excel is estimated to be about 1.5% (no one really knows for sure). I opted for an easy 1:1 dilution with distilled water, which puts it at 1.3%. Do take care handling it, and try not to inhale the fumes; although they weren't as bad as some people seem to claim.

I agree that any difference Excel makes for plant growth in a CO2-injected tank is generally going to be too small to notice; though it's possible it may benefit some plants more than others, or make up for localized deficiencies in CO2 or bad circulation, etc.
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Old 08-19-2010, 01:36 PM   #8
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okay thanks, I think what I'm getting in the co2 injected tank is more of a slight iron deficiency than anything. I dosed the csm+b a little bit higher and the reds in the crypts and repens seemed to get deep. So i'll see how a little extra iron brings out the reds. Hair algae is caused by not enough iron correct? Everything else is on EI dosing...so that's the only thing i can think of.
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Old 08-21-2010, 11:38 AM   #9
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Quote:
Originally Posted by fishykid1 View Post
where can you get metricide?
Just ordered another gallon for $ 26.99 shipping included. The best price I found was here: www.dealmed.com. (if you buy it make sure you do not use the activator and handle it with care) Good luck.

Sorry "DarkCobra" I saw your post too late
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Old 08-23-2010, 01:48 PM   #10
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Quote:
Originally Posted by DarkCobra View Post
Metricide 14-Day 1 Gallon is available at Dealmed.com for $17.15, comes out to about $25 with shipping. If you get it, throw out the separate small bottle of activator. Metricide 14-Day is 2.6% Glutaraldehyde, and Excel is estimated to be about 1.5% (no one really knows for sure). I opted for an easy 1:1 dilution with distilled water, which puts it at 1.3%. Do take care handling it, and try not to inhale the fumes; although they weren't as bad as some people seem to claim.

I agree that any difference Excel makes for plant growth in a CO2-injected tank is generally going to be too small to notice; though it's possible it may benefit some plants more than others, or make up for localized deficiencies in CO2 or bad circulation, etc.
Actually, this has been tested long ago:
http://indianaquariumhobbyist.com/co...r=asc&start=30
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Old 08-24-2010, 12:50 AM   #11
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Quote:
Originally Posted by over_stocked View Post
Actually, this has been tested long ago:
http://indianaquariumhobbyist.com/co...r=asc&start=30
Yep, I just figured I'd qualify that statement since Seachem claims to use "polycycloglutaracetal" rather than glutaraldehyde. Which is probably just marketing nonsense; but if there's any truth to it, it's possible this might have affected the results of the test method used.

Regardless, 1.5% glutaraldehyde appears to work identically to Excel.
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Old 08-26-2010, 07:04 AM   #12
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great read.

thanks, buddy.
Quote:
Originally Posted by over_stocked View Post
Actually, this has been tested long ago:
http://indianaquariumhobbyist.com/co...r=asc&start=30
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