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If you let them go they have the potential to take over. Pull them out as you see them and they will perish.

Just keep picking off every one you see. Eventually they will stop showing up.

Has your Nitrate always been so high? That's definitely not going to help. Fish don't mind that much but it will make it difficult for corals.

Whatever frozen seafood is on sale. The mixed bags is great if it's raw. Not sure about cooked. It might be OK just not what I would suggest. I blend it all up together with some RO water and Selcon or Cod Liver Oil. That way there's a variety of sizes for all of the reef inhabitants...

You didn't kill them. It was an accident. The reason for the two half-sized heater is also because sometimes heaters fail in the ON position. This can eventually cook a tank if you have one single large heater.

If you start target feeding them just before lights out they will become accustomed to feeding at that time. It's natural for them to start feeding AFTER lights out so you will need to adjust their schedule for you convenience. I use a turkey baster. Target feed the corals and let the fish...

Kinda sounds like Brooklynella but I wouldn't count on it until you post some good close-up pictures and Beth comments.

Yeah, it was definitely the temperature drop. Below 60 can't be tolerated by most of the tropical saltwater fish for very long. This is why I always recommend two smaller heaters instead of one large heater.

It can come back if you can figure out what's wrong. It does not look like brown jelly. My initial thought is low ALK or high Phosphate.

It's not required to feed them in perfect conditions but it does increase the odds of success if you spot feed them meaty seafood. Things like minced clams, prawn roe, minced scallops, squid, etc. They are carnivores, not filter feeders.

The most common issues for these are low Alkalinity, insufficient waterflow, insufficient lighting, and high Phosphate. Have you been feeding them?

Does it have any runners sending out new polyps?

That's the size of an Encrusting Gorgonian but I don't recognize the polyp shape. Anthelia or Clavularia would be my guess at this point.

I agree now that I see a picture. It's just reaching for more light. It looks healthy from what I can see.

Look up the term "gaping". This is a sign of a dying Anemone.

Resembles Clavularia I can't judge the size of it from the pics though.

Looks like some type of Tunicate.

In my opinion neiter are suitable for a 90 gallon tank. To answer the real question - no, the Sailfin will constantly stress the Powder Blue unless you have a very long tank (more than 8 feet). They will hang out together like theyare buddies but this is actually an agressive move with one...

I've never used a filter except for the occasional use of GAC to polish the water. For a reef I believe particulate filters do more harm than good.

Have you tracked your average daily alkalinity consumption? That would help with the math.