Green Water - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 14 Old 12-03-2009, 06:48 PM
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Originally Posted by hawkian View Post
Just as an FYI since I am not sure this would apply to your situation... I had the same problem after about 45 days of being "live" and believed for a few weeks that it was the "bacteria bloom" of the tank cycling. After a few weeks of the water still being green however I seemed apparent to me that this was more than a bacteria bloom. I cracked and used Accuclear, 2 days in a row. Within 48 hours, the tank was sparkly clean! Nothings return since and the water has been clear ever since and I never has to use it again. Best $10 I spent.

Now I am stuck with cyanobacteria but that's another issue best left for another day and completely unrelated to your problem
The product is not said by API to clear green water; I'm not saying it won't or didn't, but that is not a claim of API so there could have been other factors involved.

Regardless of that, using these chemicals is not recommended, notwithstanding the manufacturer claims they are not "toxic." I don't know their definition of toxic, but it likely isn't mine. These chemicals clearly stress the fish, and that is not advisable. Stress brings on health problems and the end result could be worse than cloudy or green water. Which after all can be cleared up and prevented by natural means.

I speak from experience with these clarifiers. Years ago I used one and within seconds the fish were huddled in the opposite end of the aquarium. I did a partial water change and eased their stress. API says this product "clumps tiny floating particles together" which is how most of them work. Problem is, the chemical also clumps together the fish's gills, hence the stress. I prefer not stressing out my fish in order to solve another problem. There are many experienced aquarists on this site, more so than I am, who do not advocate the use of these chemicals.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #12 of 14 Old 12-03-2009, 07:24 PM
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I have to support Byron there. I have no personal experience, but I just find it very bad idea to treat your tank's eco systems with chem's. After all you're trying to re-create a mini natural piece there and chemicals are just not natural habitat for either fish nor plants and therefore IMO should always be the VERY VERY VERY last resort. I personally would rather break my tank down and rebuilt from scratch before messing with chemicals in there.
(And I'm referring here to all these algae cleaners, "clear water" and what not is out there on the shelves; not the medications that are at times needed to not loose our fish).

~ Life Is Too Short, Break The Rules, Forgive Quickly, Kiss Slowly, Love Truly, Laugh Uncontrollably And Never Regret Anything that Made You Smile.
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post #13 of 14 Old 12-04-2009, 02:59 PM Thread Starter
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Thanks for all replies.
As for my green water problem, here's my plan.
I'll keep my current light and CO2 and I'll focus more on nutrients. Since the tank is at the end of the nitrogen cycle, nitrates are high as well as phosphate (promoting algae growth). I want to add mix of MgSO4 with KNO3 + trace elements, to try balance the macro and micro elements with existing excess of phosphate. I'll keep the 50% water change at the end of the cycle (7th day). After the tank is balanced and if I notice clear water again I'll start adding KPO4 to the mix. I'll leave lights on for 12hrs a day during the entire process.
Now, tell me what I missed and why this won't work.
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post #14 of 14 Old 12-04-2009, 08:58 PM
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Ugh! I had no idea! The bottle and everything I read about it on the net said it was safe. Well I guess you learn something new every day.

Good to know.
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