A lot of aquariums seem to house Bluestreaks in multiple aquariums, presumably for this exact reason - the Burgers' Ocean, for instance, held them in no less than 7 separate tanks on my visit two years ago!
Strangely, this seems to be much more commonplace in continental Europe than in the UK, where there are decently commonplace, but rarely in a diverse mixed-species tanks, or as many, as elsewhere. But I haven't visited enough continental collections to truly comment on this.
@Kalaw I admit that's I've only visited six or seven aquariums (aquaria?) in the U.S., but I don't recall seeing cleaner wrasses of any species in action! I'm glad to hear that they are much more widely displayed in Europe, and I'll have to pay closer attention on my next aquarium visit!
@KevinB huh, that's the exact opposite of my experience with captive cleaner wrasses, the ones I've seen kept in larger tanks with numerous other fish, they are cleaning almost constantly. In smaller tanks though, the behaviour seems much less frequent.
