Sailing with bristlenoses!! :)

Hello all!! It is some time since I didn't wrote but I'm following every day the forum! I'm a maritime officer and I love so much these small creatures that I want to keep them also onboard. My vessel itinerary is from Port Jerome (France) to Rotterdam (Netherlands). I saw that we have usesers from all the world and I tought someone can help me for example where I can find bristlenoses in Rotterdam or somewhere in Le Havre. I'm thinking to buy a small tank around 60 liters but first I need to know if i can find somewhere in this area the bristlenoses. If this will happen first I will cicle the aquarium and after that I will buy the fish. The only thing which I'm concern is the water which I have'it onboard. I think it have's to much clor inside but I will speak with the guys or maybe I will buy a fw test kit. If anyone have an idea I would be happy to hear it.
I wish you a lovely day!!

Does the PH/GH of the ships water swing quite a lot because that wouldn't be ideal and I'm guessing running an RO unit to fix the issue would make you very unpopular. I know next to nothing about ships but this sounds like a bit of a challenge.

The idea is that we are producing water onboar by condensation. I think it is quite ok. The only problem is that they are mixing this water with another water which wee are taking onboard from a water station from the terminal in France. I will ask the guys about the durity of the water because i know that they are doing some kind of tests. Thanks for the reply. I realy love this fellows so I don't want to make anything wrong.
All the best!!