You crazy Brits!
At least they are attempting, although misinformed, they are attempting to protect SW
have to say that they are the leaders in new ways/equipment over us by far !! so wouldnt knock them about that !! think its cool they care enough about their livestock but saberry hit it on the head "have them test your water " great idea !!
European practices are very different to American I guess. No one advocates a DSB
here anymore, water changes are now thought to be detrimental to reef stability and are done as infrequently as permitting, and various other little things that I can't remember right now.
i can see the water thing a bit !! reason why i think alot have issues with water changes is that the new water will never really match your tank water exactly which could cause some shock!! the reason why i feel its best if you can to have your sump big enough to pull out 20% for your bi-weekly change and keep your pumps running !! then syphon thru a airline the new water back in !! then your change isnt noticed !! what i do and think it easier on me and the tank!!