Is these crab good or not

[Alyxx]

I wish I had a tank big enough for one of those lobsters

 

[mjr]

My emerald crab likes to sleep on top of the toadstool leather at night.

 

[427HISS]

I'll start a thread about this, but I will post this question. We've had three fish die in our 14g quarantine tank in a week.
The last today, which was our blue damsel. He was swimming very well and ate about 3 hrs ago, then just found him dead.
We added a Emerald carb (I messed up on my post on page one calling him a Porcelain by mistake) three weeks ago.

The detrimental water parameters are fine.

Ammonia, nitrite are 0
Nitrate 15
PH 7.9

With years of experience behind us, I failed to understand what has happened.
The only thought is the crab killed them, even the tough damsel.

 

[mfinn]

if you found the fish being eaten by the crab, or found it with a big hunk out of it, the cause could be the crab, but if it was dead laying in a corner, I would look at other reasons.

 

[427HISS]

We found the first dead fish in the morning and it's stomach was chewed a bit, but the other two in the afternoon.

 

[mfinn]

I would suspect something other than the crab, if you had fish die during the day.

 

[GOOKRACING]

Cool lobster !
Please tell me about him.

I got this crab in Boca beach in FL when I was down there on Christmas vacation. One of the scuba diver was there, so he have me this crab, fish and this long leg crab too. The crab does a good job clean a lot on the sand bed. It seen that he hasn't bother any thing in the tank. He was only about 1/2" big and now his about 1" bigger. I just feed him a pieces of fish every day.

 

[GOOKRACING]

Yes everyone told me that the blue spine lobster are not reef safe, I took a chance and it's been 1 1/2 years and he hasn't bother any other fish or anything in the tank. He molt every 3 - 4 month was told that it will grow to about 12" or more, eats pieces of fish every day and walks around the tank a lot cleaning the sand bed. Never knows what is safe or not until you try it.

 

[427HISS]

We found the first dead fish in the morning and it's stomach was chewed a bit, but the other two in the afternoon.

Wife just told me it was overnight, just forgot to tell me until that afternoon that it was in the am.