I had noticed my koi were not well, flashing & general not feeding. I was given Deans contact details as I’m an amateur & wanted expert help & advice. I had a comprehensive assessment of my water & fish, parasites were found & they are currently being treated. I was shown how to scrape & what to look for under a microscope. Also given advice regarding biological filtration & water quality so looking to change system completely. Definitely recommend Dean for anything fish related ?