How to fix an unhealthy torch

[Lgara1303]

Hello everyone, I will make this short en suite. I bought the three hammer. Corals from Petco after making a post and hearing back, it sounds like that was the worst decision I could’ve made and these are very unhealthy and very bad looking. Overall, I thought they were just stressed out from being added a few days before and being in a tank that is not really for them but from what I’ve heard they are basically about to die so my question is now that I have them what can I do to try and save them since it’s $210 worth of coral I would like to do whatever I can to try and bring them back to the health if there’s anything possible
I have a 46 gallon bow
Canister filter
Protein skimmer
Hob filter.
Lights are nothing crazy but I have been keeping my other torch, candy cane, blasto so and I have these new torch on a frag rack. I would really appreciate any help and I will be sure to make sure my post is approved and I get it other opinions before buying from Petco again.

 

[Jekyl]

Need details please. Parameters, specifics on lighting and a video of flow in tank will move this process along.