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Blue Green Algae (cyanobacteria)

Home Forums Fresh and Brackish Water Fishes Blue Green Algae (cyanobacteria)

This topic contains 15 replies, has 5 voices, and was last updated by  thelizzious 8 years, 4 months ago.

Viewing 15 posts - 1 through 15 (of 16 total)
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  • #300217

    Fishwife
    Participant

    I’ve only had my 2ft tank set up for 2 months and I’ve had algae problems from day one. Firstly it was hair algae that came in on the bogwood I bought at the LFS, I had to throw one piece away it got that bad.

    I started treating that last week with Sera Algovec and am due to do a second treatment tomorrow, up to now it doesn’t seem to have had any effect but it does say it can take up to 6 weeks for the treatment to work.

    Yesterday I noticed that I’ve got Blue Green Algae on my gravel, today its much worse

    #313976

    Matt
    Keymaster

    I wouldn’t be surprised if the algae treatment is to blame…

    This stuff is a nightmare to get rid of, you may have to strip the tank and start again I’m afraid.

    #313980

    Bluedave
    Participant

    BGA likes low flow, low nitrates, high phosphates and a change in CO2. Low light also exacerbates the problem – so generally most of the things opposite to algae!!!

    Low flow and low nitrates is the main problem. How to get rid of it:

    1) Remove as much as possible by hand/scrubbing etc
    2) Increase flow in the affected area
    3) Check phosphates – if they are high, reduce them.
    4) Lights out for a few days
    5) Get more plants!

    If your lighting levels are less then 1.5 -2 WPG then dosing with carbon isn’t necessary. If you’ve only got three plants then dosing with carbon and feeding them is also not necessary!
    Dosing of tanks is only required in heavily planted tanks where they would not get the nutrients they need from the fish waste.

    Hope that helps.

    #313990

    Fishwife
    Participant

    Thanks for the replies

    #313994

    Bluedave
    Participant

    that 1.5 WPG, so high enough for dosing carbon but will the plants get enough from the tank without it? – it’s up to you whether you dose with the easy carbo – how were the plants doing without it? I’d be tempted to try without it.

    How about flow – thats usually the main culprit.

    Would love to see a few pics of your set up(s).

    #313996

    Fishwife
    Participant

    This is my 2ft tank before the Cyanobacteria hit

    I’ve since removed the bogwood on the right and spilt the Junccus refens in half and also planted some cut offs from it , this is it today, I’m not really happy with it but I’m more interested in getting rid of the B/G

    I’ve just taken the photo I’ve noticed the algae back again and I’m now thinking of doing a 3 day total blackout to see what happens. Do you think if I added an air stone it would help?

    There are a few things I’d like to try first, but if I finally decide to do a total restart, and throw out the gravel, plants etc. How would I clean the tank out and what about the filter?

    This is my Betta tank, a 20 litre Arcadia Arc (sorry about the light) I’m still not sure about the Feng Shui pebbles

    Attached files

    #313998

    Plaamoo
    Participant

    “How about flow – thats usually the main culprit.”

    I’ve read this many times but the worst problem I had with BGA was in my rivertank. The tank is a torrent throughout. The only way i got rid of it(temporarily as it seems to be returning after a several months absence) was by treating the tank with kanamycin. This tank does have low nitrates.
    I seem to have it in all my tanks in varying degrees. Some fish seem to feed on it. I have liniparhomaloptera disparis disparis in my 75, they gather round when I’m siphoning the edges of the tank exposing the BGA.

    #314018

    Bluedave
    Participant

    Yours is the first tank I’ve heard of Plaamoo with a high flow that has had BGA – no dead spots anywhere?

    I also thought that it was poisonous to fish so it’s interesting to hear that liniparhomaloptera may eat it – how big do they get?

    Fishwife – if your going to stirp it down completely then just wash everything well in warm water – theres no need to throw the gravel away. Keep the filter media submerged (maybe in your other tank) while you do it and then set everything back up – you won’t have to cycle again if you keep the filter media (uncleaned or rinsed in TANK water).

    You want to get to the bottom of why you have BGA first though – otherwise you’ll be stripping it down once every few months!

    #314019

    Fishwife
    Participant

    Since noticing that bit the other day it seems to have disappeared, but I still haven’t had the tank lights on at all. This weather keeps the tank quite light although I’ve been trying to see if the sun shines on the tank early morning, I don’t really think that’s the case as the room is facing north and there is a conservatory on the back which is still quite cool up to about midday. If the sun was shinning in early in the morning it would be warmer than the 18c it was at 9 o’clock this morning.

    I’ll see how it goes before attempting the strip down. Would I be able to keep the plants? or would I be better off disposing of them?

    I was thinking, could overfeeding be a cause? I’ve only had species tanks for several years and this is the first time I’ve had so many fish in one tank and I’m a bit unsure how much to feed them, although they certainly seem to eat whatever I put in.

    #314028

    Bluedave
    Participant

    Keep the plants if they are not covered in BGA – if they are you may be able to get rid of it by rinsing them in a very weak bleach mix (10:1) and then rinse thouroughly so that no bleach goes back in the tank.

    If phosphates are high then overfeeding could be high but i’d have thought your nitrates would be high as well?

    #314035

    Fishwife
    Participant

    Thanks for your help, my Nitrates are 20, but they used to be around 10. I’ve cut down on the feeding as part of my preparation for going on holiday at the end of next week. I just hope things will be OK when I get back.

    #314045

    Plaamoo
    Participant

    No dead spots Dave. It’s a 20 long with a manifold & AC 70 attached with 2 intake sponges. Also AC 70 & 50 HOB filters running. The 70 is on the end so the flow is the length of the tank. It grows right in the flow on anubias, wood, etc. Even on the intake sponges.

    The linipar I have are about 2″ and haven’t grown for the year that I’ve had them. Great little fish. I’d like to get more but they were a one time occurrence at my LFS, sold as “Hong Kong plecos”.

    #314047

    Bluedave
    Participant

    Are you sure it’s BGA and not something else? If it’s BGA – I give up!!!!! /laugh.gif” style=”vertical-align:middle” emoid=”:lol:” border=”0″ alt=”laugh.gif” />

    #314058

    Plaamoo
    Participant

    Dave, have a look at this thread form another forum. I haven’t actually seen my stiphodons eating the BGA in my tank but they are getting fat!

    http://www.plantedtank.net/forums/fish/885…-eat-algae.html

    #314066

    Bluedave
    Participant

    Interesting stuff mate, thanks for the link

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