I don’t know what it is but it is bright green and definitely growing by the day.
Does mold grow under water? I never heard of that before.
[https://i.imgur.com/ar9zFIP.jpg](
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Algae.
Where do you live? Where does your water come from?
It’s algae.
I live in the Bronx.
How strange. Bleach it everyday.
Creeping algae, gah!!:eek:
Horror movie fodder.
What have you been eating?
Yes, cut back on the asparagus.
If it’s algae, it needs sunlight to grow. I don’t know if keeping the lid down would stunt it or if it that would require total darkness.
Get some plecos or mollies . . . you’re already set up for when they die.
CMC fnord!
That’s what I was wondering! 
All the usual crap I always eat: Mountain Dew, Pringles, Dunkin’ Donuts, and meat and potatoes.
I’ve never heard of algae growing in toilet bowl before. A fish tank, sure, but never a toilet.
Either way I have Mr. Clorox on the job now so thanks for the input everybody.
On a semi related note,
Yes, mold will grow under water. NatGeo had a bit some years ago about Aspergillus causing disease and damage to corals and this wikipedia article gives it a brief mention(all I could find at the mo’, not really enough time to look it up)you have to scroll down quite a bit and be careful, it’s a short paragraph
It’s possible that it’s fecal stains, and you’ve been eating stuff containing a lot of purple food coloring. The most common purple food coloring will indeed turn your poop green.
No matter what it is, though, bleach will probably take care of it.