sad coral

Can you please help my Duncan, it doesn't look very happy. Got it 4 weeks ago. Some of the heads open most days but most of the heads do not open. The skeleton is looking colour. Parameters are (all tested with hanna): Ammonia 0.06ppm Nitrate 17.2 ppm (again higher than idea working on...

My canister filter started leaking and had to swap around back to a fluval u4 which is annoying but apparently this coral is very unhappy now. Not gunna do parameters right this moment, will update with them later but he’s sad and was flourishing a couple weeks ago. It’s an established tank...

I recently picked up this hammer and have found that it is receding. Do you think there's any hope for its survival? Do you think an iodine dip would help?

Really quick question- are these frags too high (ignore GSP) ? Ai Prime is set as shown below (Fluval Evo tank) . Never kept Acans before, I understand they prefer lower light. I am not in possession of a PAR reader and to be completely honest I am struggling to tell if this acan is happy or...