On the advice of Copps, I would advocate not medicating a new angel (at least for something that is sensitive like a regal, don't know how sensitive your H. africanus is). What I did with success for 2 regals was put them into a dark (only indirect light with the majority of the container being in shadows) acclimation tank that was connected to my system and that had rock and sand in it. They were the only inhabitants, although I did add a juvenile ocellaris to the first regal I put in there. This was a 50 gallon rubbermaid stock tank, so the sides are dark and there is only a small sliver of light that spills over into the tank from the display next to it. I offered all foods that I feed to my display with any regularity and also offered clams on the half shell. I continued to do this until it began eating pellets regularly and kept each regal in there for probably 2 months to get them eating. I did this first with a small blue belly and then did the same with a yellow belly (only reason the blue belly didn't spend another month or 2 in there was because I needed the room for the yellow belly). I periodically did freshwater dips on them but never did any other sort of medicating. This got them eating, got them used to my tank water, and then when they were eating whatever I offered and had gained weight, I added them to the display during "night" hours so that the majority of the fish were out for the evening. Did this with both of my regals and both are doing well today and eat whatever I offer.
