Oh ok, I have bloodworms that I can feed them. I might wait one more day before I feed the wrasse again because I want to make sure that ammonia does spike again.depends on the fish food. I would recommend getting frozen food, fish tend to be more responsive to it.
Also, is oxygen deprivation out of the question in terms of what might have caused the death? The reason why I ask is because the wrasse is now swimming normally again after I put an air stone in the tank. Originally, I thought that the sponge filter I had would be enough.