Dec 2020 POTM: Green or Red.

Red and Green :)
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First submission in my tank's history. Shot with iPhone 8 held up against the glass under my normal blue lights. Bonus points if anyone knows what this is? When I got the tank it was a small piece that only took up half a frag plug and has gotten to this size in about 16-17 months. Unfortunately I don't know what it is. Any ideas?


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