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Old 04-22-2013, 02:45 PM   #1 
Saphira101
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Exclamation HELP!!! White fuzzy stuff growing in tank during Maracyn 2 treatment!

Hi everyone.

As you may know, one of my Bettas, Merlin, has columnaris. I have been treating him using Maracyn Two by Mardel. All has been well and I'm on day 3 of treatment. But today when I woke up, there was this white fungus-y stuff covering everything but Merlin himself. Merlin also had some new fuzzies on him. () I was wondering if it was because I left all of the plants in his tank?

I need to know what to do about it though, A.S.A.P. Can I do a 100% water change and keep doing meds for the last two days, or should I start all over? Should I remove the plants??

Please help!

Thanks, Saphira
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Old 04-22-2013, 08:16 PM   #2 
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I wonder if the antibiotic is killing off some of the bacteria in the tank.... The Mardel info sheet says that Maracyn 2 won't affect the beneficial bacteria (BB). But.....

Can you test the water parameters? Ammonia, nitrates, nitrites, pH?

The half life of Minocycline is 11-23 hours. Full treatment period is 5 days, and you're on day 3.... But I know that if my tank started showing white fuzzy stuff, I'd be unhappy! Also, some strains of Columnaris are resistant to Maracyn 2.

So.... two potential options for you to think about:
1) Do a water change, to remove whatever the white stuff is. Then, continue the treatment for days 4 and 5.... Or
2) Change medications....

Personally, I'm concerned that Merlin has NEW fuzzies on him. Due to the speed at which Columnaris can grow, I think I would opt to change meds. (Between the fuzzy tank and the fuzzy fish, I wouldn't be happy!).... You could try one of the other meds that treats Columnaris:
  • Kanaplex (Kanamycin)
  • Furan 2 (or) Bifuran (or) Jungle Fungus Clear (all three products contain the same two furan antibiotics)
  • Triple Sulfa
Info from:
Maracyn 2 Info Sheet and Directions
Minocycline Fact Sheet

Last edited by LittleBlueFishlets; 04-22-2013 at 08:21 PM.
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Old 04-22-2013, 08:37 PM   #3 
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It's possible that the white fuzzy stuff is shed slime coat that is coming off in response to the treatment.

Are the plants live? Many plants don't react well to medications and whenever possible, it's best to medicate in a hospital tank without plants or a filter. So it's possible the plants are reacting to the medication as well.

How is Merlin acting other than the new fuzzies?
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Old 04-22-2013, 08:40 PM   #4 
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Saphira101 - can you post a photo of the stuff in the tank, and a photo of Merlin? That might help people figure out what it is.
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Old 04-22-2013, 10:33 PM   #5 
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Merlin is acting normal, despite the new fuzzies.

Yes, the plants are live.

Hopefully you can see the slimy stuff in this photo:


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I will get back to you with the water parameters soon.

Last edited by Saphira101; 04-22-2013 at 10:49 PM.
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Old 04-22-2013, 10:43 PM   #6 
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I can see the second photo. It looks similar to the kind of slimy stuff that usually accumulates in a barebottom tank. It's either bacteria or slime coat or something. Most likely it's nothing to worry about in itself although if it's gross, you can do a water change and redose the meds.
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Old 04-22-2013, 11:14 PM   #7 
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Can I do a 100% water change?

Here are the parameters BTW:

pH: 6.4 - 6.6
Ammonia: 0 ppm
Nitrate: 0 ppm
Nitrite: 0 ppm

All of the parameters seem OK, except for pH. How can I fix that?
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Old 04-23-2013, 10:49 AM   #8 
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No, your pH is fine. Unless your pH in your tap water is like 8.0 and it drops to that level overnight. If that is the case, then there's a problem.

If you want to do a 100% change, sure. I don't suggest it usually because most people don't like 100% changes (me, I love 'em).
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Old 04-23-2013, 05:48 PM   #9 
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Thank you!
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Old 04-23-2013, 11:19 PM   #10 
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I just did a 100% water change. When I took out the swords, the largest leaf literally disintegrated in my hand. Wow. :/
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