Duncan coral frag!
I did a water change today on my 10g tank and my duncan closed up, it's been open ever since I got it literally. Testing parameters tomorrow. No fish on tank just 2 zoa frags, green star polyps, darth maul paly, goniastrea frag. Unknown number of snails and crabs, 2 peppermint shrimp.
Aquaclear20? W/ chemipure elite and a whisper internal filter with bio rings.
Lights are an odyssea 72w (18wx4) 2 actinic 2 10k