ok bigmarc buddy this is the thing and i am not calling your LFS person out hes an old timer and like all old timers there going to say let it take its course and usually right so, i am not a fish vet but i am a sergeant in law enforcement my dept is fish you can call me a game warden or fish police but i have been working in the fish dept local fish and fisheries enforcement and pet shop regulation for 12 years, i have been a hobbyist for 21+ years, if it is internal parasites you can hold a fish in hand while administer meds with a syringe if you squeeze hard than yeah your going to hurt the fish and the protective slime coat, sometimes you have to cause stress to actually help a fish, the drugs you need will more than likely be prescribed from a vet, if you have that service available to you in your area, if not than likely there will be nothing you can do about this and allow nature to take its course, yes it sucks but this is the hobby most pet shops and distributors look at fish as a profit and rarely taken into account that fish are living creatures, so yeah its tough and i have lost fish before that made me sad as well, like my frontosa they can live for 25 years thats a long time for a cichlid and would be sad to see them die such a short life, thats why i made the comment of med soup most hobbyist dump chemicals and meds in there tank when the slightest occurence happens and often so more harm is done when this occurs, those med flakes are not going to work if the fish will not eat than your at a loss on that issue, hence the forced fed route with the meds you can syringe, there are meds that say they will cure parasite by just adding to the water sometimes these work most of time they wont, but when you start to talk about high medical prices when it comes to a vet service with a fish most hobbyist will say have a good life fishy and buy another, i know crazy aye, but this is what happens aye, good luck my friend..