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So was out today and stopped by some LFS. There were plenty of nice coral and fish, I saw a very nice large green carpet nem. Then later saw a nice gonipora. I almost took the plunge in buying both but then my senses kicked in, I walked out of the stores. The nem was way to big for my tank...
In my case Vibrant saved my tank so I say its effective short term. I did not continue dosing afterwards but did slowly wind dosage down before stopping.
It does look a fresh wound from fighting or scraped some how. I'm no expert either; just keep an eye it and everyone else.
I never used Erythromycin in a SW tank so cannot comment.
No. Its a glass bowl you can plants in, mainly used in FW tanks. The glass planter looked like this.
https://www.amazon.com/gp/aw/d/B074T8BLCF/ref=mp_s_a_1_3?ie=UTF8&qid=1534124371&sr=8-3&keywords=aquarium+planter&dpPl=1&dpID=41Zb9PN87kL&ref=plSrch#
On FB I saw a video of nems in those aquarium planters. The were suctioned cup to the back wall. Nem was inside n clown was in it too. Weird concept but cool to see. Lost the link sorry.