Well your tubes will have to be exactly the same length, width and must never get blocked.
Water will take the easiest path.
then you need to make sure that water in = water out in all of the tanks. That's the hard part.
Few reasons why it would be unlikely -
1. They supply shops. It is likely they are contractually bound to supply those shops and not the public.
Individuals cannot purchase as much as shops. Why bother supplying individuals and bypassing the shops that put food on the wholesalers table?
2. A shop is less likely to default on receivables than any one individual.
3. It takes time to build a long relationship with wholesalers. I can only imagine how many PMs a wholesaler would get on here asking to sell fish and bypass the shops with no second thought. There is a chain of command if you can call it that. I still think the best way to get fish in is to approach a retail outlet and let them use their relationships and scale economies to push through an order.
Somewhere along the line we all need to step back and look at how reasonable / unreasonable our requests may be.
one of those sharp razer blades works well apparently. The only cory eggs I have ever removed were stuck to plant leaves. possibly because there are more plants in my tank than there is glass available for them :lol: