That's a nice start. As for the animal on the glass, I don't have a reference point for size, but it may be a hydroid.
If they're small enough and you get lucky, you can try peppermint shrimp, although I had a pepp chow down on a frogspawn a few years ago and vowed never to add them again! :lol2:
There are also berghia nudibranchs and others have had success with kalk paste, but you would need to watch for alk spikes.
I've had thoughts of adding a shrimp. I didn't know Peppermint shrimp eat Aiptasia.
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Looks great, what're you using in terms of chemical filtration (if any)?