so this gunk appeared in my 20 tank. these are the largest clusters, but it covers the substrate. i siphoned sand and changed water yesterday.

major changes to tank: i have just recently removed a whole bunch of fish and added a betta.

fish removed: 8 black neon tetras, 4 glass catfish, 1 dwarf gourami
fish stocked: 3 cory cats, 1 clown pleco, 1 halfmoon betta.

H2O params tell me i need to do another water change, which i will do. NO3 is a bit high for a tank with so little fish. but any other advice will be great!

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fish tanks are art. they represent the imagination of their owner, and one's desire to create something beautiful that enriches its environment.

EW! Looks like a fungus to me. Is it accumulating gradually or seemingly overnight?

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soon as i removed fish and decor. its been 48 hrs and h2o cleared up but this is still floating arnd tank.h

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fish tanks are art. they represent the imagination of their owner, and one's desire to create something beautiful that enriches its environment.

Do you have live plants in there or just the plastic?

I get some of this in my 40 but it comes from my driftwood which is still pretty new.It doesnt hurt anything its just ugly.Siphons up pretty easily.I believe it is a type of algae but am unsure tbh of what exactly it is.

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http://bountifulbettas.blogspot.com/

"Come to the dark side....we have cookies...and filters/heaters/and water changes!"

used to be fake. planted 2 days ago, just after posting thread.

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fish tanks are art. they represent the imagination of their owner, and one's desire to create something beautiful that enriches its environment.