Fish are dying ! help !

Aight , so first of all, hi everyone here. It’s my first thread here, an i’m posting for a really sad reason. My fish are dying !

Here’s my storie:

2 weeks ago, i bought 2 anemona , 1 bubble anemona ( the light green 1 ) and another 1 that i can’t remember the name. 1 of those stuck itself in a powerhead .. we think cause when i wake up the next morning , 1 yellow tang, 1 korean angel , 1 mandarin , 1 wrass etc etc were dead ! I’ve been to my local fish store and the guy told me : Your anemona died and it realeased toxines into the tank … thats whats kill your fish. Well alright, but i keep wondering why some fished haven’t died the same day ?? only the 50$ + fish died, invertebrates are still tthere, corals too.

The guy from the local fish store told me to make a water changer in the tank, it’s been done. i’ve test the water and everything is fine, so i bought another yellow tang on sunday the 6th just to give it a try so see if it will be alright.

Monday it looks fine, Tuesday looks good, so i buy 1 new coral ( kinda mushroom or something like that, can’t remember the name ) and it’s look fine, the Chromis , clown fish , fire goby and invertebrates looks awesome, no health problem for them.

So i woke up this morning and BLAM , the yellow tang was dead ! i’ve test water and it’s perfect , i just don’t know whats going on, all other fishes and invertebrates are looking good ! Why only the tang and korean angel seems to die ??

I’ve got a 30 gallons with t5 lights … water is about 28 degrees… HELP !

Please if you have any tips tell me plz

P.S : sorry for poor english , i’m a french canadian

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Fish are dying ! help !

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