Strange Red Leg Crab behavior (FATAL) Help please!

[robertg]

I woke up this morning and found one of my grabs which appeared to be ripped out of its shell lying dead on the sand. Another grab cannot seem to get up off his side and the other crabs are showing similar behavior... The only two things different from yesterday are that I added a very small blue hippo tang and some kick ich because it appeared he might have a small spot of itch. The kick itch says its invert safe, any ideas what is going on?

 

[meowzer]

II would get water made up to a good size w/c asap.....also can you add an airline to add oxygen
ALSO....STOP using the kick ich.....get a QT set up ASAP and read about doing hypo on your fish
Is the tang your only fish??

 

[1guydude]

+1 sounds like the kick ich is soaking up the o2 in ur system! Never used the stuff but i wouldnt dose my DT with any meds or anything i wasnt testing for!