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This post was misplaced. Sorry.

I hope you took out the dead damsel, not the crab. The fish might have died because your tank wasn't cycled at that point.

These guys looked robust and seemed to have a good time for many months. All of the sudden they - well - died all out! It took them less than 24h to suffer a total extinction from my tank. Note: the only change in the water parameters I can think of is the salinity: evaporation is out of...

These guys are swimming like jellyfish or mollusks do. They react to stimuli by taking off the glass and swim away. Nice creatures. I only hope they are not dangerous (my favorite inhabitant - the spiny lobster - have recently died after a short and intense agony). Seeing some pics I now lean...

It moves like octopus and has a tendency to attach itself to surfaces with its tentacles. Most have 8 of them.

Here is an image:

What are these? (About 1.5 mm across the longest axis.)

BTW (and sorry for splitting the posts): if you have just set up the tank before it cycled this could explain the poor state of the zoanthids. I would wait before adding anything new till the cycling is over (cca 4 weeks).

As far as I know the mushrooms usually defeat the zoanthids if the territorial issues ever emerge.

[Instead of a picture (I'll upload it when I can): a hairy chunky crab, about 0.5 in across the longest axis of the body, yellow ends of lags, dark shall, light hair, possibly red eyes.] This hitchhiker looks cute but how safe is it? It took me a month to first observe it (just as I was getting...

It turns out they really are worms. They live in tiny rigid tubes and will retract to them when scared. A couple are big enough to observe this but I just couldn't take a good picture.

These don't seem to spread noticeably and they have never grown bigger than what you see on the picture. I have one peppermint shrimp in the tank that enjoys exploring these rocks and may control the population of these hitchhikers.

There is the purple reef lobster, which belongs to real lobsters. It is also reef safe. The problem I have experienced is that they don't do well in small tanks where water parameters vary too much. Besides they hide most of the time, night and day. They are not very active at all. The spiny...

Couldn't Google anything quite similar. They don't seem to grow in size. Here is another pic of 3 specimens.

Freeze dried krill is his favorite. Eats from my (clean/glowed) hand too. Otherwise he finds any non-living organic matter in the tank. He explores a lot. Oh, BTW: he eats bristle worms. He might have exterminated the whole population in my tank. Very efficient.

If there was the ammonia spike, there very likely was a nitrite spike too - with a time delay. The loss of shrimp coincided with something in water (it's unlikely that the deaths were unrelated) and prior to the event you detected hi ammonia; must have been nitrites.

He is very outgoing, more than what I would expect of a lobster. I bought him in a nice LFS in Queens, New York.

This guy is very cool: amazing behavior, very active and a good cleaner. Not considered quite reef safe but has been tolerant to soft corals I have. I enjoyed having him for a month now together with a bunch of shrimp and other small inverts.

How are you testing for nitrites. If you had an ammonia spike you probably started a micro-cycle, which should have resulted in the increase of nitrites some time after the spike. Shrimp are very sensitive to nitrites and even small concentrations can kill them. I've had a similar situation with...

I am wondering if a 4 inch deep send bad, covering say 10-20% of the ground, would have any significant effect on nitrates in a 15g tank. How good are green hair and other green algae in removing nitrates?