That is awesome that it shows good blue color when small, Good score!! I used to be disappointed in them when they came in and were a muddy yellowish - greenish color. If it changes to more yellow, don't freak out, they will do this some times.
Look very closely at the eyes and watch for clear -ish opaque ovals, kind of like see through fish scales on the eyes. Also watch closely for a foggy appearance of the eyes. Other places to watch are the edges of the fins and where the pectoral fins meet the body. These are all areas that trematodes will congregate in higher populations. The eves are probably the first and easiest place to spot them. If you see no symptoms, this does not mean it doesn't have them. They can be very small and grow large enough over a couple weeks to be seen. Keep it in quarantine at least two weeks to see if anything develops.
I think it's worth mentioning that this fish is also susceptible to the more common parasites, most commonly Cryptocaryon irritans, what is often incorrectly refer to as ICH. This would be the more common little white spots on the fishes body. Treatment options are numerous. Sometimes just getting the fish stronger through good food fortified with supplements such as Saltwater Vita-Chem is enough. Soaking the food in a garlic supplement is another option that often works. If treatment is needed, some of the better copper based medications are safe to use with this fish (note that not all fish deal with copper treatments real well - powder blue tangs for example) I prefer Odinex, Cupramine or cuprerex maintained at about 1.5 to 2.0 PPM for 14 days. Of these meds, cupramine made by sea-chem is probably the easier to find and safer to use med. I have accidentally overdosed this med and not harmed the fish where as Odinex is a better - faster acting med, if you goof up with it you'll likely kill your fish.
Well, hopefully you won't have to deal with any of these parasite issues but it's better to prevent an infestation and to be prepared for it if it happens. Kudos to you for quarantining the fish first. It's a very good habit to get into.
Joel
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