Hey MFK, I was toying with the idea of doing a native tank and thought it would be a ton of fun to go and collect all the substrate (rubble rock) as well as the drift wood and big rocks from my local river as well as catch myself a nice herichthys cyanoguttatus for a 90. I am not concerned about bringing in any number of nasties with the decor as it will all be extensively boiled in a large tub over a fire. However I am concerned about the fish itself, what kind of measure/treatments should I take to ensure that he is a healthy fish? Would a barrage of internal/external anti parasite/bacterial/fungal meds over the course of a several weeks be overkill?