please advise, have some ???

Hey everyone just had a few questions and thought I'd add it all to one thread, please let me know if you'd prefer it sperate in future.
Last night I came home and my juvenile false perc looked really bloated, I mean his stomache looked huge like he was gonna explode...needless to say I was worried but this morning he's back to his normal shape. What is this and is it common?

At night my yellow tangs body gets a dark look in the middle and the stripe goes white...is this normal?

My rics were spewing this brown stringy slime stuff from their mouths, what is this?





thanks everyone.

 

Perc : maybe just swallowed some air? Maybe???

Yellow tang: normal, at night some fish "change" color. I think its cause they slow down their metabolism or something like that.

Ric: probebly just pooping. allot of corals do that. Just keep an eye on it and if he comes back to normal that was it.

Marc.