What is this and why does it happen?

  • We are currently upgrading MFK. thanks! -neo
Hah!....looks like we have similar tastes as I have that same piece.That layout looks nice as well.
I was going for the Oliver knott discus tank. Because discus live under roots of trees on the shores on the Amazon river so I thought it'd be great for them idk if I should get a second one or not?
 
I actually have a pair of those roots and I place them at both ends of the tank when I use them.
 
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