Indeed, each fish is different! I did fine with larger tetras (Colombians are lovely!) for years with my chocolates. Wasn't until the last year that they've gotten into eating everything. Hard to believe that my chocolates are 6-7 years old now!
As for UV's, I've personally had good luck with my Turbo Twists, but I'm no expert and haven't had experience with other makes. I'd research the costs of replacement bulbs, and the flow rates needed for killing parasites. Algae and bacteria are much easier to kill, parasites take quite a bit more exposure (AKA slower flow) to knock them out.
-Ryan
As for UV's, I've personally had good luck with my Turbo Twists, but I'm no expert and haven't had experience with other makes. I'd research the costs of replacement bulbs, and the flow rates needed for killing parasites. Algae and bacteria are much easier to kill, parasites take quite a bit more exposure (AKA slower flow) to knock them out.
-Ryan