Zoanthids and Anemone problem

[Gargamel35]

My tank is fairly new. 4 months old and i have brown diatoms in sand.

Water parameters are:

Temp. 25 C
Salinity: 1.025
NO3: 0
Ph4: 0
Mg: 1400
Ca: 435
Kh: 7,5

I change 10% water every week.
Everything looked ok until a week ago, when most of the Zoanthids closed. One is ok, but others are half closed or completely closed.

I didn't change light or flow. I tried to move them elsewhere but didn't work.
I did notice i dosed Kh too little that week and it droped from 8.0 to 7.5.
Now i'm slowly dosing every day to bring the level back up.

Yesterday i noticed my Anemone shrinked a lot. Then it went for a walk (it didn't move for a month before). And today i found it floating around (dead) and the water was cloudy.

I removed the Anemone and changed 10% of water. I hope others will be ok but i just don't understand what is going on. Other corals and fish look ok so far.

 

[Diana A]

You need to remove a lot more water now do to the death of the anemone

 

[billdogg]

You need to remove a lot more water now do to the death of the anemone

^^^This^^^


Carbon is your friend. Lots and lots of carbon. Wet skimming. and a few 50%+ water changes.

What size tank? It's quite possible that there has been some alleopathy (chemical warfare) amongst the inhabitants with the Anemone being the loser.