HOT runs individual air driven sponge filters for each each tank so there is no cross contamination on that end. What specifically should I ask for? Like do I want import or home grown? Those kinds of questions so I can gauge if they are any good or not. Their pricing is less then Han's, but they don't have such a beautiful variety. I looked at some of his pictures. It is amazing. $100+ is a bit too rich for my blood. HOT does have full adults that I believe they will sell, they are just kept in their display tanks. I know at least one of the guys there used to own a store in which he sold discus, however I don't know how long his store lasted lol, or the kind of care he took with the tanks. It was a while ago though. Is a 3"+ too small?
Your question is a bit difficult to answer properly.
If they're locally bred, they will likely be small discus - under 3" which I would avoid if I were you.
If they're imported, ask them details of the source of their discus - name of the exporter(s) & their location(s). Imported are usually a safer bet than home-grown by a local breeder, dependent on what/who the sources are.
And of course, another consideration is which type has the strains & coloration you're looking for.
Quite frankly, it's difficult to advise you without seeing pics of the discus they carry - can you take some photos & display them here for us to look at before you commit to them.
If you can, take pics of their 3" fish, and their adult fish, and the prices asked for each group.
If they're 3" or larger (which would be fine for you to start with in your 75 gal, set up in the manner you earlier described) you may be ok. But of course they need to be healthy, well-shaped and from a good source, to be determined from your inquiries. And I would need to have that info & see photos of them, that is if you want my advice on their suitability.
Home grown are good, if they're of sufficient size and from an experienced, reliable breeder.
Imported are generally good too, if they too are supplied by a known reputable exporter.
For example, if the source is from Germany, or Singapore, or Malaysia, or even Hong kong, you'd probably get discus of very good, or reasonably good quality. If the source is from Thailand, or elsewhere, the quality may be quite questionable.
Let me know what you're able to find out and take pics if you can.