I used to sell Marimo (Japanese moss balls) and after quitting, I have several left.
Would it be safe to let these live in the water portion of my Pixie tank?

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These are Marimo and they're all about this size. They are free-floating and grow at a very slow rate of MAYBE 5 mm a year.

This is my tank setup >
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Edit: I've got between 15-17 of these left. If anyone wants one or a couple, let me know. I'd just charge a little over a dollar for shipping if you're in the states.