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Rainbowfish & Nitrates

Tank is 180l and reasonably well planted. Tank mates are 9 Sterbai Cory, 14 black Neon tetras, 5 otos, 1 SAE, 10 amanos and 6 nerites (all have been in there at least a few months and most around a year)

Filtered by an Eheim Classic 600 (1,000 lph) and a sponge filter that is destined for my betta tank if I ever get the time to set it up.
 
Hi all,
It might be Mycobacteriosis, I think <"Rainbowfish are particularly prone to it">.

I actually now think that the problems with my Threadfin Rainbows (and possibly the fish pictured in the linked thread?) may have been thryroid goiter, caused by a lack of iodine.

cheers Darrel

Interesting, I hadn't really considered it could be something lacking in my tap water.

Did you attempt to add iodine or just move away from keeping rainbowfish?

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Just got them out to have a look at and gave them a dip in some Methylene Blue. The one who physically looks OK but spends a lot of time at the surface is looking a bit better. The other which is more active has worse sores than I thought.

Will give them another bath tomorrow and see how they look at the weekend.
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Hi all,
Did you attempt to add iodine or just move away from keeping rainbowfish?
Both, I only ever kept Threadfins, but I would like to go back to keeping either Threadfin Rainbows (Iriatherina werneri) (or Pseudomugil gertrudae) at some point.

Looking at your photo from above I think unfortunately that that is mycobacteriosis.

cheers Darrel
 
Looking at your photo from above I think unfortunately that that is mycobacteriosis.
Is that as bad as some places make out with some recommendations being to nuke the tank and euthanise everything.
I thought this was pretty rampant so I would have expected to see signs in the other inhabitants?

Will try and get a picture of the other one when I head downstairs in a minute as it does look more like flexibacter (columnaris) than the picture in the thread above (it is more on the lips and does look a bit fungus like). That one doesn't have the protruding lumps this one has

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