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Gold Mauls?

Has there been any new additions lately? (fish or invertebrates)

Foraminiferans. These are generally harmless, but after seeing that picture the tips of these could definitely be a little irritating. If you want to remove them just get yourself some tweezers and...

Woops... DP.

It might be one of those Grape corals.

Saltwater Aquarium Corals for Marine Reef Aquariums: Grape Coral - Aquacultured, USA, Euphyllia cristata

Aquarium Corals: Corals of the Genus Euphyllia...

Just out of curiosity, but what kind of an ammonia level would constitute a full blown cycle? Does the presence of any ammonia in an established tank mean that the biological filter has been...

I've got some Aquaclear heaters that have been with me for years on end without any problems. It was pretty much set it & forget it.

Vermetid snail.

Snails That Worm Their Way Into Tanks by Ronald L. Shimek, Ph.D. - Reefkeeping.com

Check this out.

Aquarium Invertebrates: Zoanthids: Polyps As Cute As A Button — Advanced Aquarist | Aquarist Magazine and Blog

HTH.