Pretty but not really necessary... I don't quite get what you're supposed to do with it.
Generally, a single male betta requires a tank of between 1 and 5 gallons with 2 being the preferred minimum size. The tank needs to be heated (bettas are tropical fish) and filtration is optional but highly recommended. With 5 or more gallons you can consider adding tankmates like otocinclus, pygmy corydoras or shrimp. Community fish are generally not recommended as tankmates, although there are a few species that will sometimes cohabit with bettas.
You can keep multiple male bettas in their own tanks as described above, or in divided tanks (which save on power costs because it's cheaper to heat and filter one big tank than umpteen small ones.) The divisions should have a capacity of 2 to 5 gallons each, and should be shaped so that the betta can turn and swim comfortably.
Females can be kept individually or in a sorority tank with multiple females. Such a tank needs to be fairly large in betta terms (ten gallons minimum), filtered and heated, and contain no less than four or five females (this disperses the aggression). It should also be well planted and well furnished with hiding places. You also need to be prepared to remove the odd fish that causes problems, as sometimes you will get either a tank bully or a tank runt that all the other fish gang up on.
Males cannot be kept permanently with females, and if that's what the tank above is suggesting, then its not going to work.
Breeding bettas is not easy, I have just come out the rough side of yet another failed attempt - I did everything by the book, spent plenty and again the male attacked the female and I didn't get eggs.
Before you breed, you need to condition the male and female. This means two weeks of very good feeding, more than they would normally get and mostly live and frozen foods. After this time, most breeders use a setup involving a half full ten gallon tank. The tank should be bare bottomed. Then a lot of hiding places are created, and a large glass jar is put in the tank. Between the glass jar and the wall of the tank, you can wedge half of a styrofoam cup (or float a piece of bubble wrap on the water). This is where the male should build his nest. Usually the male is conditioned in the spawning tank, and after the two weeks, the female is put in the glass jar (referred to as the chimney).
She should be left there for two days. If she hasn't already filled with eggs she will do so now, and the male will build his nest. After this time the female can be let out. Usually this will result in a spawning.
So TBH I don't see what the flash tank does. The 'female section' is large enough to be a sorority, but IMO it's not a good idea to keep females where they can always see the male... this will result in them being perpetually full of eggs and they could become eggbound and die. I just don't see the sort of breeding setup I'm used to in that tank. The other side is large enough for the male though, definitely. Hmm... I wonder if the idea is to keep a number of females on the large side and one male on the other, and then let a single female through at a time? If so, I don't think it will work - not only will it result in more fry than you can handle, but eggbound females, a stressed male, and perhaps some messy lines as well if multiple females are used.
By the way, before you start investing in breeding equipment, have you got a way of heating and cleaning potentially 100 small containers? A betta spawn can involve 200 or more fry, of which about half will be male. They will need to be separated at least a month and a half before they are large enough to be sold, or they will start killing each other. If kept in the usual sized growout cups (which are about the same size as the pet store cups, fortunately they are temporary!) the water will need to be changed twice a day to keep the ammonia down.
If you have the space and the time, it's definitely worth it... bettas are amazing, I can't get enough of them, and it's a real shame mine Will Not Breed.
/cgi.ebay.co.uk/AQUARIUM-BETTA-SPLEN...A1%7C240%3A1318
