Not fish, this time, but a coral. Toadstools don't want to live in my tank, and I really don't know why. And I really want to know why.
Some info about the tank. It's a 32 G tank, with a 17 G sump. It's been running since June, and contains two fishes, some small SPS and a colony of zoas.
Water parameters are:
Nitrate: 0-2
Strontium: 10
phosphate: 0
Calcium: 330
Nitrite: 0
Magnesium: 1200
KH/alkalinity: 8/2,85
SG 1.026
Lights: 4 X 39 W T5
The story of my toadstools are like this. When I started the tank, I got a toadstool with the LR. It was thriving in my tank, and it was beautiful to watch. Then I went on vacation. While I was away, my friend who was supposed to refill water, forgot what she was doing, and overfilled the tank, and flooded my floor. This meant that the SG dropped pretty much, pretty quickly, and it stayed that way for about 5 days, until I came home again. The toadstool was still alive then, but not very satisfied with the situation. Unfortunately I came home with new fish too, and because ot them, I had to raise the SG quickly to be able to put the new fish (and some shrimps) into the tank. This killed the toadstool off.

The LR and the other corals survived though. A few weeks later, I bought a new toadstool to replace the first one. That one survived one day! I had no idea what happened. It barely put out its "tentacles" after it came here, and it retreated them pretty quickly, and then died off. I didn't know if it was the moving that killed it, so I thought I would make one more try. On Saturday I bought one mor, a bigger one. After acclimatizing it, I put it into the tank, and it seemed so satisfied with its new life. It put out all its "tentacles" pretty quickly, and looked very good. I went to bed. When I got up next day, it wasn't in such a good mood anymore. All the "tentacles" were in, and it seemed to get more and more angry with me during the day. In the evening I moved it to a bucked of clean SW, but it didn't make it. It has died off too, and I am really upset about it. It was a beautiful one! So what is killing them off, and so quickly? Could it be the zoas poisoning it? Please help me, as I want to keep one. I am so in love with that kind of coral!