It's great to see another guy picking up the hobby. It's not for everyone, and it takes a lot of effort to stay in the wild betta scene. Here are some answers to your questions
1. Can they be kept in a community tank with other small fish like Endlers?
In general, no, as bettas do have a tendency to show excessive aggression to those who are milder than they are, and conversely, they are stressed out by other faster fish. Endlers might end up getting eaten.
2. Do they need to have the black water supplements or those ketapang leaves?
Almost all species of betta will appreciate black water, but i find that all of them can be acclimatized to aged tap water with no adverse effects to their health. Albeit you'll find that they color up nicely in lower pH waters, if you find that lowering pH is too much of a trouble, then neutral soft water will do.
3. Are they very aggressive?
Definitely. Conspecific and congeneric aggression is quite high, although species like patoti and splendens do have bigger reputation of killing their tankmates when they reach maturity.
4. Are there any captive bred ones? it would break my heart to have to buy a pair from the wild as I strongly feel they should be left there...unless of course, I can't find them ... then screw it.
You can find lots of captive bred ones. I'm sure almost all the aquarium shops in Singapore carry them at one time or another. Alternatively, the market place in AQ is a fine place to look for your wish-list items.
5. What are potential companion fishes for them?
They do best in monospecific tanks.
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