Wow,
Dragon let me begin by saying that thanks to your ability to take pictures, I have identified the crab. In my opinion 90 percent of crabs are bad for a mini reef and only 10 percent are good. And let me tell you that according to your pic, you pulled out a good crab, let me explain.
He is called a decorator crab. They are harmless and only scavengers in a tank. They look so ugly because they walk around finding anything in a reef to place on top of their sticky body. With time they have all sorts of little stuff around there body, hence the name decorator crab. This serves them in the wild to hide against predation.
In your case he was just pinching the ric probably to get some pieces to stick on his body, I have seen them walk around with anenomes and mushroom attached to their bodys.
Okay, they do get big so I don't know if you would have wanted him in your tank. I thought he was the bad hairy crab that I have had in the past, but from your pic, he looks like the good crab.
Have incysor identify him, I would get a second opinion, because I'm only 75 percent sure it's a decorative crab.
The Blenny needs to go bye bye, because he will continute with his bad habits, that will not change. The only thing I can tell you is that, never purchase a new piece during your work week. The reason is that you are not home to referee any problems with compatibility.
I come home from work and notice that my hair algae are growing too much and decided to add my 4 medium sized red leg hermits to remedy the situation. I have little blue ones in the tank and they just don't get the algae like the reds.
So I transfer them from my 2.5 into my 12 gallon. And within one minute I notice the blue hermit attacks my red for the shell, and the red starts losing his legs, I'm like no way, that red is bigger than the blue and is losing the fight. I take my stick and try to break up the fight, with no avail. So I reach in with my hand and the blue hermit won't let go.
No way, so I pull them out of the tank and then place them on the counter top, and the blue finally lets go, the red is totally retract and the blue is trying to fight me, wow I place the red back in the nano and take mr mean blue into the 2.5 and drop his ass in.
The 2.5 has nothing but live rock. I was like had I not been there, the red would have died. He lost 3 legs in the fight, I hope he recovers poor little dude, it was a mean fight, wish I had captured it in real time video.
But that tells you that you shouldn't trust your instinct that nothing will happen while you are at work, remember what happened to my plate coral with the mean frog spawn, I left to work come back and he's all stung on his left side, luckly incysor gives me some advice raise them higher so the tentacles don't sweep each other.
So the lesson is do a purchase in the weekend or if Sandra can be home.
As for the bugs you have in your tank, congrats, they are good bugs known as amphipods, They are a sign that your water quality is really good and they serve to break down debris. It's amazing how quickly you are able to take pics and get response time.
Did your friend adrian, see the pic of the decorative crab before he advised you to pull him out?
Mike
http://www.liveaquaria.com/product/prod ... CatId=1962
http://www.divegallery.com/decocrab3.htm
I found some links, that mostly likely indicate, it's a decorator crab aka as a sponge crab.