Is this Green Dust Algae?
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Old 04-16-2013, 02:57 PM   #1
fishman76092
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Is this Green Dust Algae?


In my 30+ years of the hobby, I've never had or seen this before. See pic below- I CANNOT GET IT TO ORIENT RIGHT ON THIS SITE(click and it shows it right side up). Its basically a green film that looks like a typical protein film....except that its green. I wipe the acrylic that gets exposed when I do weekly water changes and it kinda goes away for a couple of days then comes back. It looks like little round balls of green when it accumulates in the corners. I've tried a 3 day blackout and it came back a few days later. From the other places I've read, GDA sticks to the glass, but its only on the surface in my tank. Any help would be appreciated.

Here are the stats that I'm sure I'll get asked for:

100g 60" x 18" x 21"H Acrylic
2x XP3 , one with spray bar, one with cone- both pointed at surface
320W 6500K T5 8 hours daily on timer
Aquariumplants.com substrate
Plants-
  • 2x Amazon sword
  • Lots of Jungle Val
  • 4x Red Lotus
Fish:
  • Barilius canarensis
  • Chuco microphthalmus
  • HRP
  • Thor. maculipinnis
  • Clown loaches
  • BNP x 4
Dosing:
  • Excel 2x week
  • Flourish 1x week
  • Root tabs
Parameters:
  • 6.8 pH
  • 0 on ammonia, nitrite, nitrate
  • No clue on hardness, although Chicago water is typically soft

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Old 04-17-2013, 07:07 PM   #2
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Nobody?
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Old 04-17-2013, 07:33 PM   #3
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Looks like "surface scum" a protein film. I think if it were GDA the glass would be affected. I had read somewhere that protein film will not break with a finger inserted into the water. The other film, iron bacteria, will.

You can remove most of it with a paper towel. Decreasing the organics by water changes, various medias like purigen, and a surface skimmer should do the trick.
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Old 04-17-2013, 08:40 PM   #4
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Holy crap what is that. Looks pretty thick than normal surface scum
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Old 04-18-2013, 03:38 AM   #5
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Not GDA, fortunately.

A surface skimmer will take care of it, so will more water changes, Carbon, purigen, More surface turbulence etc.
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Old 04-18-2013, 04:54 AM   #6
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+1

Get your siphon going and remove as much as you can, holding the intake just below the surface.

Are you dosing any macros?

~ Adam

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Originally Posted by plantbrain View Post
Not GDA, fortunately.

A surface skimmer will take care of it, so will more water changes, Carbon, purigen, More surface turbulence etc.
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Old 04-20-2013, 02:09 AM   #7
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Quote:
Originally Posted by Adam C View Post
+1

Get your siphon going and remove as much as you can, holding the intake just below the surface.

Are you dosing any macros?

~ Adam
I'm running two XP3 - one with a spray bar and one with the V exhaust....both pointed up at the surface. There is some serious current at the top. Its not a protein film as its literally bright green. I did the siphoning on the surface and the paper towel thing and have done two different black outs and it keeps coming back.....I've never seen it in over three decades and its driving me crazy. As for macro dosing- I'm only doing Excel, root tabs and flourish, so no. I've done them in the past with stem plants, but given what I have I didnt think I needed to. Frankly I probably only need to do root tabs.
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Old 04-20-2013, 02:10 AM   #8
fishman76092
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Quote:
Originally Posted by plantbrain View Post
Not GDA, fortunately.

A surface skimmer will take care of it, so will more water changes, Carbon, purigen, More surface turbulence etc.
i'm changing 50% weekly and feeding 1x daily algae tabs and marine flakes. I'll throw some carbon in the canisters.
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Old 04-20-2013, 02:30 AM   #9
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I noticed you mentioned you were from IL and I happened to come across this article.
I wonder if this might not be the culprit:

http://www.epa.state.il.us/water/sur...een-algae.html

It looks similar, but we're viewing from below. If it is BGA, you might need to increase your nitrAtes since they are at zero according to your IP.
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