Tank going crazy

hey guys im really stressed right now i need some help....
my blue regal tang died about a week ago and now my sailfin tang is doing bad. he swims in flips for a while . and then he is fine and starts eating... i also have a large fowlers tang and he is picking on my purple tang. should i move my purple to my 30 gallon for a few days? and three days ago i moved my rocks to bring my brisstle starfish to school .... ever since then everything has been crazy? what should i do .

any help is apreciated. thanks

 

What are your parameters, how many gallons, what type of fish, corals, inverts do you have? Kinda sounds like a spike in the water to me. How long have you had the tank? Sometimes tangs can fight till the death for terriatory in a tank not sutiable enough for the kind of species.

 

maybe a space issue. im not a expert by anymeans but i think for a tank to hold that many tangs would have to be huge like 180+

 

its 180 gallon tank..had it for almost a year now...the tangs have never really showed much agression ... just the sailfin and purple everyonce in a while...but ohter fish i have a lunar wrasse , clown trigger, blue ring angle, harlequin tusk, a zebra moray, and a white spot grouper.
i have no corals and just the one brisslt starfish.

 

im upgrading to a 320 in a few weeks ... any ideas just to help calm them down or anything... maybe a big water change?

 

by moving the rocks around your livestock might have to restablish territorym and for what its worth my opinion is that your pretty overstocked, even for a 180.

 

would a water change help the situation?

 

Unfortunately I agree, the behavior is probably influenced by a confined space. Yes technically the fish has what most would consider enough room, but you see this in some tangs secondary to captivity IMO.

I would cut back on some the larger fish and try some smaller reef fish, like wrasses and anthias.

 

so long as your paramters are in line a water change may only make it worse. it can be a lot of stress.

i would leave the lights off for most of the day for a couple days. might calm everyone down

if you have a good relationship with a LFS you might be able to have them hold some of your fish for a while a reintroduce them, or even better maybe redo you stocking

 

ok thanks alot i have a really good connection with them ... thanks