Hi Dimorb,
Sorry for the delay getting back to you, things have been busy lately. Until very recently the answer would have been no, because of challenges with exporting our sampling kits. But we have recently set up a partnership with a European company who will be distributing our sampling kits for clients in Europe, in addition to their own customized water chemistry service. So we'll be able to offer the service officially soon..
maybe we can arrange something sooner unofficially and consider it part of testing the logistics of international service. This sounds like an interesting test case. I'll email with more thoughts, after I catch up on the thread.
We've generally found few bacterial fish pathogens in aquarium water samples... P. damselae shows up in a minority of tanks, some of which report fish deaths and some report no problems. Vibrio fortis shows up here in an even smaller fraction of tanks, but I've only seen this described as a pathogen for restricted cases (seahorses).
More recently we've expanded to testing the eDNA (environmental DNA) for eukaryotic targets too, in an effort to catch the eukryotic parasites responsible for the most widely discussed fish diseases. No problem detecting or identifying these known parasites, the remaining questions are about sensitivity and the interpretation of negative results. So its very useful to test samples from fish that are known to be sick.
-Eli