Uv to reduce green water - The Planted Tank Forum
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post #1 of 9 (permalink) Old 03-24-2019, 10:01 PM Thread Starter
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Uv to reduce green water

Hello, 20 gallon tank, tall hex, lots of Anubias, java moss, Marimo. 78 degrees , 1 dwarf gourami, 5 platies. Green water on and off. Want it gone. Do I need a uv sterilizing filter like the killing machine? Or could I just run a Uv stick on light bar from eBay / amazon? I don’t mess around with the algaesides , dangerous stuff! Tank is cycled , good readings, just having some issues with algae blooms . Cheers!!
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post #2 of 9 (permalink) Old 03-25-2019, 11:02 AM
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UV needs to be shielded so it doesn't blind anyone or anything.
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post #3 of 9 (permalink) Old 03-25-2019, 02:31 PM
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A UV sterilizing filter will work, I've done it, but I must say having gone through both that and the "wait and see" approach, I'd opt for waiting instead of intervening. I went through a seemingly endless period of greenwater on my 10 gallon tanks last summer, I couldn't believe how quickly the water would turn murky and green even after a 90% water change. I just stayed diligent and eventually the greenwater resolved itself and *this is key* has never returned. Nor have other algae issues. This is why I think waiting through it is best, even though I know how unsatisfying it is to look at. I believe it is better for the tank to reach its own equilibrium if possible because if you are treating or intervening there's always a chance you're going to knock something else out of whack and just have a constant battle with the various things that can show up in your tank.

My other issue with the UV sterilizing filters that I bought is that they are loud and pretty big (and yes I bought 2 sizes of the name brand Green Killing Machines). I don't have anything against the technology really, and I think UV sterilization is better than a lot of other options. So if you do want to try it go ahead, it's not likely to hurt anything.

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post #4 of 9 (permalink) Old 03-25-2019, 04:21 PM
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I had a lack of patience with green water and after constant water changing I ended up getting the green killing machine. It worked well. They’re super cheap in comparison to in line units and it reflects a little in the product. One dead pump out of the box but the company took care of it.
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post #5 of 9 (permalink) Old 03-27-2019, 04:47 PM Thread Starter
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thank you, machine is great!
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post #6 of 9 (permalink) Old 03-27-2019, 06:09 PM
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I've not seen a lot written about this ... but greenwater algae have predators. These include large ciliates like Paramecia. These will feast on the algae and may explain why green water often disappears on its own: The paramecia population has multiplied enough to control it. UV sterilization works against this, rather like how overuse of pesticides can backfire by killing the spiders that feed on pest insects. It's something I'd like to learn more about.
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post #7 of 9 (permalink) Old 03-28-2019, 08:50 PM
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Quote:
Originally Posted by kgbudge View Post
I've not seen a lot written about this ... but greenwater algae have predators. These include large ciliates like Paramecia. These will feast on the algae and may explain why green water often disappears on its own: The paramecia population has multiplied enough to control it. UV sterilization works against this, rather like how overuse of pesticides can backfire by killing the spiders that feed on pest insects. It's something I'd like to learn more about.
Thanks for the info, this is very interesting (and similar to issues we're finding with antibiotics - killing the beneficial stuff along with pathogens).

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post #8 of 9 (permalink) Old 04-03-2019, 03:54 PM
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Best thing you can get against the green water - daphnias. There is pretty large species - Daphnia magna, which small aquarium fish can't eat. These crustaceans will clean your tank in day or two in natural way.
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post #9 of 9 (permalink) Old 04-03-2019, 04:00 PM
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It's probably better the tackle the issue of WHY you have green water. Does the tank get direct sunlight at any time during the day? For how long? What is you lighting solution and how long is it on per day. What substrate are you using? Any fertilizers?


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