What is killing my clowns?

Sad update

The last clown in the tank just died. Hours after i dosed prazi. I dosed because i saw the clown flashing and some erratic swimming as of yesterday, exactly the same as what i saw in the big clowns i got last week. This fish never done this before. Dosed at 4pm, left house at 6pm and fish was fine. Even eating. Came back at 10 and its dead. Water very cloudy. Had this particular fish for 2 months now and it has always been thin so i treated with prazi twice and started feeding GC laced pellets(HF recipe) 2 weeks ago since i noticed white poop. Yesterday and today i noticed alot of very bright white(looks like PTFE tape) stringy poop at the bottom of the tank thats pretty big and long. As long as the fish. The fish is 2.5cm long? Not even an inch maybe.

Now that the tank is empty i removed all the bio media and im soaking it overnight in chlorinated tap water and a squirt of prazi for fun to kill off anything. Not bleaching this tho cause im not sure if i can reuse it if i do?. Tank will be taken down tomorrow and everything will be throughly bleached and will be set up again. Was told bleach soak would kill practically all the parasites and even eggs or tomonts.

I also tested the temp today throughout the day with a temp pen which is accurate up to 0.1c. Temp in the morning 28c temp at hottest time of day 29.5c. Tested po4 too, it was almost undetectable. Probably 0.03 or 0.02. Nitrate still 10. Ph was 8.
 

WHAT PART OF LIVING WITH A REEF TOOK YOU BY SURPRISE?

  • How much space the supplies and equipment take up

    Votes: 10 41.7%
  • Salt creep, spills, and cleanup outside the tank

    Votes: 3 12.5%
  • Planning trips or finding someone to care for the reef

    Votes: 7 29.2%
  • How attached I’d get to individual animals

    Votes: 2 8.3%
  • Making decisions when there’s no clear right answer

    Votes: 5 20.8%
  • How much the reef affects everyday household life

    Votes: 6 25.0%
  • Nothing in particular, I felt well prepared

    Votes: 1 4.2%
  • Other (Post in the comments)

    Votes: 1 4.2%
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