They can get depressed, but NOT lonely. Don't ever buy a 'friend' for your beta fish- they will fight until one dies! If your beta seems depressed, try putting something colorful near his tank, or get him a ping pong ball, etc.
If it is like a black clump then its your fishes feaces(crap).clean it out
a male Betta will usually like the company of other fish but will fight or kill others of their kind also they might fight guppies cause they look similar to a female Betta.
If it is a male betta and its finns are not openned (like when they get angry), while he is looking at the reflection (I'm guessing it's almost like a mirror reflection) there is something wrong about your fish. Maybe he/she is lonely, or it is breeding season for your fish. But careful about putting two betta fishes in one tank~!
Other Fishes eat mainly plankton, but bigger fishes like sharks do if the clown fish doesnt hide in time
Betta fishes like any other fish can get stressed by movements. In fact one of the most stressful experiences for a fish is travel from the pet store to a new house. So, depending on the length of the travel, yes, you might be able to take your betta fish. If its a short travel, make sure you double bag and bag again with a bubble wrap and cover it with something dark (so the fish doesn't get stressed by the outside). I don't recommend taking the betta on long distance or on flights. Hope I answered your question. Source: Owner of betta fishes
Male betta fish tend to be very aggressive. They are best alone unless theres a special type of specie they can get along with. They like to have personal space. And as using fighter fish you probably refer to Siamese fighting fish which is betta fish
No, unless their lesbian.
fishes and other aquatic animals like crustaceans.
There are over 20 members of the Betta family that I know of. They are all small fish and all have the same labyrinthine breathing system. None of them have the magnificent finnage of the common Betta splendens though. Other relations of the Betta are all of the other Anabantids including the Gouramies.
Betta are social fish. There is nothing wrong.
Bettas are dumb as rocks. If you put another betta, any other anabantid like a gourami, or any long-finned fish in with a betta, the betta will fight it because he will think it's another betta. If you put a short-finned fish in with your betta, they'll live together peacefully.
a fat betta fish