Nasty algae on my rocks.
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Old 04-08-2013, 11:13 PM   #1
CallMeSteveO
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Nasty algae on my rocks.


I have had my 10g planted tank set up for about a month.
I have a handful of red hydro's, a hand full of gal, & two small Anubis.
AC-20 filter. heater. co2 @ 1 bubbler per 2.5 seconds
(2) 23 watt CFL bulbs hung vertically above tank.

Livestock:
(2) Oto's.
(5) Ghost shrimp. *Just to make sure the water was safe before I get my CPO's*


I have been getting good growth and color out of my plants & had a normal algae bloom after the aquarium cycled.

Now I have some algae that looks like green slime on my rocks and gravel. What can I do to cure the issue.




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Old 04-08-2013, 11:30 PM   #2
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Blue green algae.
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Old 04-08-2013, 11:33 PM   #3
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Flourish Excel will kill it. Dose carefully however.
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Old 04-08-2013, 11:44 PM   #4
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I have been dosing flourish excel for about 2 weeks now. 1ml per day. The algae came in only 2 or 3 days ago.
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Old 04-08-2013, 11:46 PM   #5
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Default Nasty algae on my rocks.

Extra nutrients then? Do a WC and cut down to .5ml every other day


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Old 04-09-2013, 12:18 AM   #6
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Just dose a little extra nitrogen....that will kill it. Dose a little extra for about a week. You can siphon it off, but unless you correct the lack of N, it will return.
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Old 04-09-2013, 12:23 AM   #7
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agree; also, since it appears to be concentrated in certain areas, I would use a small siphon hose to remove those large patches before dosing the N, and that will probably take care of it.
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Old 04-09-2013, 12:23 AM   #8
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Default Re: Nasty algae on my rocks.

BGA is not algae, it is actually a bacteria. It is toxic and no living thing will eat it.

Clean by hand/vacuume then 200mg of erythromicin per 10g 5 days in a row. Mardel Maracyn from Petco or PetSmart is the same stuff.

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Old 04-09-2013, 01:58 AM   #9
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Dose nitrogen? Is excel nitrogen?
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Old 04-09-2013, 02:02 AM   #10
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Nvm found flourish nitrogen. Would adding some fish increase nitrogen by having waste?
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Old 04-09-2013, 02:45 AM   #11
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I also had this and the only way to kill it permanently was erythromicin like ovt said.
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Old 04-09-2013, 12:59 PM   #12
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Yes, it is a bacteria, but I would think twice about dosing antibiotics into my system....you will kill the nitrifying bacteria in your tank which can cause the system to "mini-cycle" again leading to additional problems.

Antibiotics will kill the current blue-green algae for now, BUT IT IS NOT A PERMANENT SOLUTION! It can and will return if the nitrogen issue isn't addressed. The antibiotics will go inert, and will quickly be siphoned out with water changes. The bacteria will return....

The nitrogen needed to kill the BGA is not readily available from fish waste....I would just dose it directly.
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Old 04-09-2013, 02:39 PM   #13
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Lets not condemn an entire phylum of organisms for the actions of a few species that cause trouble for unknown reasons. Big trouble and very important to be aware however!

Some cyanos are very nutritious and edible and some are cultivated for such things as biofuel and nutritional supplements, a species is used in rice paddies to fertilize the crop and cyano create an awful lot of oxygen for the planet. Lots of critters eat various species but it isn't a good idea to get critters just for that purpose. Stiphodon is supposed to eat cyano and I am sure it is present in the biofilm my otos and bristlenose are eating but they wouldn't eat cyano by itself.

Water movement and reducing the organics in the tank seem to help. I get it at the substrate/tank interface and shoving a plastic card buries it out of sight and vacuuming the surface without picking up substrate harasses it enough that it doesn't creep up onto plants. If you have a problem then remove it with something like an airline siphon and adding nitrate for starters then if that doesn't put it back in a few days then use the antibiotic. If the nitrate and airline doesn't help it will grow back within a day!
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Old 04-09-2013, 03:00 PM   #14
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I have a small amount of this as well, but seems to be growing fast. I read that one good way of dealing with it is dosing PMDD and doing max 1 WC every two weeks. It said that dosing the ready nutrient mixes you can buy at stores would be counter productive, and the PMDD should only be KN03, KH2PO4 and K2SO4

Not at all sure if the source is reliable, but since I have PMDD already Ill give it a shot and let you know ^^
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Old 04-09-2013, 04:28 PM   #15
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......or you could just simply dose the Nitrogen as I've suggested many times......

Adding antibiotics is always risky....it will kill the BGA, but could take your cycled tank along with it. It's happened to me twice, and it ends up being more of a hassle than it's worth. Until you fix the underlying issue, which is that you need to dose more nitrogen, it will return. Are you going to use antibiotics constantly??

You don't need gobies to eat it, you don't need everything in the PMDD, and we aren't debating the importance of BGA or cyanos. Straightforward answer: Siphon out the BGA that you see, and up your nitrogen dosing. Your KNO3 is off just by a little bit; fix it, and you'll be fine forever. Problem solved.
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