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It's probably a Mantis or Pistol Shrimp as you've already guessed. I would not worry about your fish. They will continue to hunt the Shrimp. Is this 30 gallon tank just your quarantine tank?

They are drab. Closeups tend to find hidden colors in fish. This picture makes me think of Jabba the Hut.

I hadn't considered "pretty" as a Lawnmower descriptive. Eye of the beholder I suppose.

Lawnmower Blenny. They love to eat Diatoms off hard surfaces.

Looks like stress discoloration to me too. Is it more pronounced at night if you look at it with a flashlight?

No, but if you're going to get a cleaner shrimp I would recommend getting at least two of the same species. Which species are you considering?

Have you considered a Pencil Streak Rabbitfish?

I have enough old aquarium equipment to fill a small bedroom. I really need to get rid of all that junk. Some of it is from the 70's :confused:

Clown Goby would be perfect with a Firefish.

This guy had a great personality.

My understanding is that it is also harmful to Dinoflagellates. Harm the Dino and you kill your corals.

The horizontal adds a slight amount of head but insignificant for your purposes. The vertical head is what you should be using to calculate head pressure. Use the distance from the water level in the sump to the water level in the display. It wouldn't hurt to subtract GPH for each elbow to...

A couple thoughts: What in your tank would produce ammonia? It would seem the live rock you acquired was already cured so wouldn't have much die-off. In my opinion, ammonia levels above 1.0ppm are harmful to the cycle so a steady 0.25 - 0.50 ppm ammonia level is what you want. Try adding...

I'd guess an Oyster or a Turkey Wing Clam.

Add the fish food to feed the bacteria to keep their populations up while you have no fish. Hermits live just fine eating the algae off the rocks.

And some even have a warranty.

You haven't seen Whelk egg cases have you?;)

I'm not any type of glass expert so I hope you go for another opinion. My understanding is that tempered glass is harder and won't bow as much for a rimless tank.