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film of thick green sluge ontop of water
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pnut
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Joined: 04 Mar 2005
Location: Perth, Western Australia

PostPosted: 2005.04.11(Mon)1:34    Post subject: film of thick green sluge ontop of water Reply with quote

hey guy and girls

just wondering if anyone can help me I have this continuous film of thick green sluge I think it's algae that sits on top of my tank. I have tried scooping it up doing lots of water changes even 75% water changes and it goes away for a day or 2 then it comes back again, it's really anoying me and I can't get rid of it can anyone help?

it;s a 160L (45 g) planted tank have lots of different plants, about 15 fish neons, barbs, and some others, got 4 x 36w lights which are on 14 hrs a day, canister filter and readings are
pH - 7.4
KH - 4
gh - 6
no2 - is fine
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Darkblade48
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Joined: 21 Jun 2004
Location: Toronto, Ontario. Canada

PostPosted: 2005.04.16(Sat)1:48    Post subject: Reply with quote

Wow, you have 3.2 wpg Very Happy I wish I could have that much lighting.

From your description, it probably and is most likely algae.

You said your NO2 levels were "fine" but anything more than 0 is not "fine"

What are your NO3 and PO4 levels? Do you inject CO2? Do you add supplementary fertilizers?

If the answer to the latter 2 questions were "no" then that'd be your problem. With 3.2 wpg, you'd have to have CO2 injection as well as supplementary fertilization for the plants to outcompete the algae. Otherwise, you'd get that insane algal bloom as you've already noticed.

Edit: Oh yes, I almost forgot that your lighting period is a bit long for my taste. I only keep my lights on for 11 hours. You might want to try reducing your photoperiod as well in order to combat the algae
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pnut
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Joined: 04 Mar 2005
Location: Perth, Western Australia

PostPosted: 2005.04.16(Sat)6:59    Post subject: Reply with quote

hey mate cheers for the reply , I'm unsure of the no3 levels and the other one I don't have the test kits Shocked
I do inject co2 into my tank and I do use fertiliser but I have stoped using the fertiliser because I thought that it may have been the cause of this green crap on top of my water!

I hate this stuff I want to get rid of it, my fish eat up all the food I give them so I don't over feed, unsure what else to do
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Darkblade48
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Joined: 21 Jun 2004
Location: Toronto, Ontario. Canada

PostPosted: 2005.04.16(Sat)14:49    Post subject: Reply with quote

The moment you stopped the fertilizer additions, the algae easily would have gotten the upper hand. At first, the algae might have appeared due to an imbalance in your system. Once you stopped the addition of the fertilizers, you merely widened the advantage that the algae had over the plants.

You will want to manually remove as much of the algae as you can (assuming you can), and then take appropriate action (I.e. resume fertilization, slowly, a blackout may be necesary if you were dealing with green water, etc). You could also consider investing in a surface skimmer, though some people won't like it (including me) as in a heavily planted tank, the leaf litter just clogs the thing up within a week.
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Irons
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Joined: 27 Feb 2003
Location: Buffalo, NY

PostPosted: 2005.04.17(Sun)7:53    Post subject: Reply with quote

Your description makes it sound like BGA. Using your KH and pH on Chuck Gadd's site. It looks like your only running 4.8ppm of CO2. Which is about 1/2 of the 10ppm target. Were I you I would:

1) Remove a much as possible.
2) Increase or replenish your CO2.
3) Get a NO3 kit and test.
4) Get your N-P-K and CO2 number inline with your plants needs.

You may consider increasing your water circulation. Maybe a little more surface agitation in that area.
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