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Discussion Starter · #1 ·
So after a search, I cant seem to find anything about this.

I have some bright pink algea growing on the suction cup for my thermometer. Atleast I think its algea, its definetly spreading, but not to the silicone tank seams yet. Its not on anything but the suction cup.

Is it even algea? Or maybe just a chemical reaction changing its color? I have the same suction cups in 3 other tanks, under the same basic conditions and there are all still clean and clear.

Thanks!
 

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I don't have anything pink in my aquariums, but I do get a pink buildup on my shower head and some other areas in my shower. I believe it is a buildup of fluoride that is added to the drinking water. I wonder if that's what you're experiencing. I've never heard of algae that isn't green, black or brown in freshwater aquariums.
 

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I've seen pink cyanobacteria in saltwater tanks before, but I don't think I've ever seen it in a freshwater system.
 

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Discussion Starter · #4 ·
Well, here's a photo of it. Any thoughts now? The cup is upside down now, the darker side was up.
 

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I'm thinking more of a chemical reaction than anything. I have the same thermometer but my cup is black not white. Maybe take it out and scrub it clean.

I'm wierd, I'd smell it before cleaning it to see if it gives off an odor.

When in doubt, get a new thermometer. I think that one is like $4.50 at petco.
 

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It does look just like sw cyano, but it could be something else. I know that yeast can be pink, but idk about that in an aquarium.
 
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