So I've been looking around online at some fish breeders and I found one I liked for GBRs. They say when fish arrive they are very weak from the 2 day fasting plus the stress of transportation. That all tanks have opportunistic viruses, so dose one time with melafix or para guard. Thoughts on this? What if there are no other fish in the tank? Skip at your own risk? Debatable if necessary? If I do this which one is better to use? Thanks!