Hi Idawn74403,
Here's a list of suppliers that may have the products you and your boyfriend can use for your koi and pond supplies business, please check them out;
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Hope this helps. Please let us know how you get on by leaving a review on the supplier's profile page.
Cheers! :)
P.S. It'd would be nice to see more friendly faces on the forum, so if you can do add your photo to your profile. Thanks!