Thank you for all the advise and feedback. Some of the fish did have loss of appetite and were acting reclusive before they died.
Latest Update -
Yesterday, I met with Dr. Sharon R. Tiberio, DVM, CertAqV in Dallas. She is a Certified Aquatic Veterinarian.
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Drove up to Dallas with my almost dying last butterfly (he did not end up making the trip) and rest of the dead fish that I had preserved along with water samples. She was going to do some tissue cultures on the fish. I am going to get an update from her later today but from her initial lab results, it shows heavy Booklynella infection plus a few Cryptocaryon (Marine Ick) on some of the fish. I will ask her about Velvet.
I am now down to 1 fish in this 150G and a bunch of snails. The illness completely killed all the fish in the tank except for this wrasse. Lost coupe of saddleback clowns, yellow pyramid butterfly's and chocolate tangs.
The remaining Wrasse is still alive and there visually seems to have no impacts to him. This wrasse is called
Macropharyngodon moyeri, Moyer’s leopard wrasse. Link -
Macropharyngodon moyeri is a unique leopard wrasse from the waters of Japan | Reef Builders | The Reef and Saltwater Aquarium Blog
He is swimming around and eating as well. He is showing no signs/ symptoms of any illness. Atleast I am not seeing any (have shared some pictures). He is the only fish remaining in this tank. I am frankly at a loss with regards to next steps. Should I try to remove him and treat him for Brook or leave him alone in the tank? Just avoiding to not having to euthanize him. I would assume Brook is in this tank as it killed the rest of the livestock..
From my 65G, the 2 Orange clown fish are also doing fine. They are the only fish left. Included a picture of them from this morning. If Ick is in their tank, should I treat them or leave them alone for 90 days and observe?
This has been a very expensive lesson to date and I think my next steps may be to have the 150G emptied out and sitting dry/idle for the next 3 months. Not sure if anyone has advise in this matter....