Nice job. Very informative. A lot of stores that sell bettas need to have care sheets available.

But I do have to say that guppies are one of the few fish that actually has a good chance of living peacfully with a betta. I have always had guppies with my bettas & still do, so do many of my friends & family, none of us has ever had a problem at all.
When I was searching for info on bettas on the net I found more sites that said guppies are ok for most bettas than I did sites that said they are not a good fish to add with a betta.

And although most bettas don't like a strong current, many do enjoy a small current. Frank is constantly playing in the current. It is so cute. My first 2 bettas liked the current too, all the others I have had did not have any current in their tank so I don't know how they would of re-acted.