Flourish Excel vs. Metricide - The Planted Tank Forum
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post #1 of 10 (permalink) Old 10-09-2018, 04:04 PM Thread Starter
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Flourish Excel vs. Metricide

Anyone have thoughts on using Metricide instead of Flourish Excel? I switched to Metricide back in the Spring and I think I've noticed a decrease in effectiveness, not by much, but I want to say there's more algae in my tank than before. Am I crazy or have others experienced this as well? Post your stories, help me decide if the cheaper cost of Metricide is worth it
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post #2 of 10 (permalink) Old 10-09-2018, 04:23 PM
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I've not found a significant difference, but I will admit I've not used it consistently (daily) for more than a few months at a time. Are you sure you've got the right dilution? I know metricide comes in a few forms and some may be more diluted than Excel is. It's also possible you're keeping it in a different situation. A small bottle of excel may not last as long, and therefore be "fresher" than an old gallon jug of Metricide, which (at least with small tanks) could last well beyond a year once it's opened. I think the bottle recommends keeping it cool, and out of sunlight to help it stay "fresh."

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post #3 of 10 (permalink) Old 10-10-2018, 12:10 AM Thread Starter
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I've not found a significant difference, but I will admit I've not used it consistently (daily) for more than a few months at a time. Are you sure you've got the right dilution? I know metricide comes in a few forms and some may be more diluted than Excel is. It's also possible you're keeping it in a different situation. A small bottle of excel may not last as long, and therefore be "fresher" than an old gallon jug of Metricide, which (at least with small tanks) could last well beyond a year once it's opened. I think the bottle recommends keeping it cool, and out of sunlight to help it stay "fresh."
I've got the Metricide 14 and it's stored in my cabinet under the tank, so heat/light shouldn't be a problem. I was doing 2 capfuls daily in my 30 gallon and 3 or 4 in my 55 gal
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post #4 of 10 (permalink) Old 10-10-2018, 02:21 AM
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I've got the Metricide 14 and it's stored in my cabinet under the tank, so heat/light shouldn't be a problem. I was doing 2 capfuls daily in my 30 gallon and 3 or 4 in my 55 gal

Be careful not to get it on your hands. It can cause rashes and allergic skin reactions. I had a drop land on my arm and didn't know until I had a nasty burn mark. I mention that because "capful" as you said, just gives me mental images of messy pouring. I use cheap plastic pipettes I got from Amazon for like $2 for a dozen. I only use a couple ml a day in my 20 gallon. Though I've extremely overdosed in a vase before to see what would happen to some hair grass.

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post #5 of 10 (permalink) Old 10-11-2018, 12:19 AM
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Be careful not to get it on your hands. It can cause rashes and allergic skin reactions. I had a drop land on my arm and didn't know until I had a nasty burn mark.
Actually, glutaraldehyde won't cause rashes/allergic reactions. It is corrosive, which is why it causes the burns!
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post #6 of 10 (permalink) Old 10-15-2018, 08:24 PM
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Quote:
Originally Posted by britter2 View Post
I've got the Metricide 14 and it's stored in my cabinet under the tank, so heat/light shouldn't be a problem. I was doing 2 capfuls daily in my 30 gallon and 3 or 4 in my 55 gal

Be careful not to get it on your hands. It can cause rashes and allergic skin reactions. I had a drop land on my arm and didn't know until I had a nasty burn mark. I mention that because "capful" as you said, just gives me mental images of messy pouring. I use cheap plastic pipettes I got from Amazon for like $2 for a dozen. I only use a couple ml a day in my 20 gallon. Though I've extremely overdosed in a vase before to see what would happen to some hair grass.

What happened with the hair grass? Curious.

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post #7 of 10 (permalink) Old 10-16-2018, 03:26 PM
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What happened with the hair grass? Curious.

It actually did surprisingly well. Nothing else was in the vase, just dirt, some hair grass and a few inches of water. I can't recall how much I used, but it was easily 2 to 4 times more than the recommended dose. Maybe even 10 or more. It was maybe half a gallon of water if I'm being super generous, and I may have used as much as 1ml of excel or more. It was more-or-less a success, it just fell on the back burner so to speak, and stopped getting attention and eventually was lost to the ravages of the monster known as "moving".


Now that I think more about it, it seems like it might be fun to do it again.

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post #8 of 10 (permalink) Old 10-20-2018, 01:09 AM
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Glutaraldehyde is Dangerous, and I don't use it at all in any form. Read this article on it.https://www.sunkengardens.net/blog/2...glutaraldehyde
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post #9 of 10 (permalink) Old 10-21-2018, 04:16 PM
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Interesting read. Not sure I'm 100% on board without knowing more of the blog authors credentials, but I think I might start wearing gloves again when using this product. Chemical burns are one thing, autoimmune disease and neurotoxin are words I take pretty seriously. Now what do I do to dispose of the rest when my CO2 equipment is finished being set up? I'll need to Google that.

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post #10 of 10 (permalink) Old 10-21-2018, 04:28 PM
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Interesting read. Not sure I'm 100% on board without knowing more of the blog authors credentials, but I think I might start wearing gloves again when using this product. Chemical burns are one thing, autoimmune disease and neurotoxin are words I take pretty seriously. Now what do I do to dispose of the rest when my CO2 equipment is finished being set up? I'll need to Google that.
http://msdssearch.dow.com/PublishedL...romPage=GetDoc

Quote:
Disposal of Glutaraldehyde Solutions
Two environmentally acceptable methods exist for disposing of
solutions of glutaraldehyde.
• Dilution
The simpler method involves further dilution to an
essentially non microbiocidal concentration (less than 5 ppm
active) in order to allow the glutaraldehyde to biodegrade.

Chemical Inactivation
The second procedure requires chemical inactivation with
sodium hydroxide prior to disposal using the previously
described deactivation method
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