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As with other goldfish, they require moderate care and attention, and the most important aspect about this type of goldfish is to watch out for fungal growth on the long fins. As such, water must always be clean and best is, check for early sign of fungal development or sickness. Watch out also for excessive nibbing exhibited by other aggressive goldfish or tank mates as this can cause the fins to be easily damaged. If this happens, the only way to overcome the problem is segregate the fish. Today many Veiltails were cross-bred to produce different variants such as the telescope-eyed Veiltail.
Source: www.allabout-aquariumfish.com