Internal parasite treatment?

[Lazonby]

I think that my cichlids (Green Terror, 3 Convicts, and 2 JD's) have internal parasites of some kind. I've noticed my GT has had clear, stringy poop, along with a reduced appetite over the past couple of weeks. I've also noticed that my convicts have clear poo as well, but they still eat well. Would internal parasites be a proper diagnosis from these symptoms? There are no other symptoms or unusual behavior.

If so, they are in a 100g tank, so treating the tank would not be a good idea. I'd like to treat via medicated food. I'm assuming that if one has it, they all have it, so they could all use the med'd food. As a last resort, I could use a Q tank, but I'd rather save this option for last.

I currently have the following meds by Aquatronics: Disco-Worm, Discomed, Hex-A-Mit, and Kanacyn. I also have a liquid de-wormer for dogs that was suggested by my LFS owner that many of his customers use to de-worm discus. There's a certain chemical I had to look for, so it's not just any de-wormer. Are these meds effective and which one would be the best?

Also, what kind of food is best to treat with? I have TetraMin Pro flakes, Omega One cichlid pellets, Hikari Cichlid Complete, and frozen bloodworms.

Any other info would be helpful. Thanks in advance!

[Cearbhaill]

Clear stringy poops are indeed a symptom of internal parasites.

Diflubenzuron (Dimilin)? Lufenuron (Program)? Both are good for external parasites like anchor worms or fish lice- these are flea meds in dogs.
Praziquantel (droncit) for gill flukes and intestinal worms- used for tapeworms in dogs. There are many drugs that do crossover duty between fish and dogs.

Metronidazole (Flagyl) for protozoan nasties in the gut (like hexamita) can be gotten from a veterinarian but is much easier (and more effective IMO) to use a medicated food like Metro-Med.
Similarly Medi-Gold is an antibiotic food that contains sulfadimethoxine, ormetoprim sulfa, oxolinic acid, and kannamycin.
Both Metro-Med and Medi-Gold are formulated and sold by Goldfish Connection (http://www.goldfishconnection.com/), but I have actually used the foods on my own discus.

Goldfish are routinely given treatments of just about all of the above while in quarantine- most are chock full of parasites and I can't imagine that Discus are in any better shape. I've often wondered why the Discus community does not recommend at least a few of these treatments on new fish- I believe it would save a heap of trouble- but I haven't been into Discus long enough to offer a more informed opinion.

I have new Discus babies right now and I'm feeding them Metro-Med one meal a day with no ill effects after two weeks. I used Prazi on 'em while they were in quarantine too.