They've developed pretty quickly over 2ish weeks. At first I thought it was just really thick biofilm alone but it seems like a mix. These strands are actually anchored/attached at each end. They have tension and there's a variety of things tangled in them. In pic 4 i plucked one end loose and it came apart into biofilm(?), a long Najas guadalupensis stem, poops(?), and other tiny bits of debris. I had added ostracods directly from my backyard fountain (MN) and think something else hitchhiked. I remember seeing small black worm looking things in the fountain before but never paid them much attention
by Azzan_Grublin
2 Comments
Cyanobacteria
Yep, Cyanobacteria.
Some snails eat it, normally in an aquarium I would improve water movement, but this is not really possible in a jar. If you don’t mind it, you can let it be. Adding more/different plants or changing the lighting situation could help if it starts smothering everything.