suds
water
Check out my friend's website- bettafishstream.webs.com
Asia#about any where. lots of people have beta fish as pets.
If it is like a black clump then its your fishes feaces(crap).clean it out
Tropical Asia Rainforests slow streams and puddles and Paddy fields.
They live in stagnant ponds and rice patties in Southeast Asia.
it depends some fish can be less aggressive than others i had a male Betta that lived fine for years with gold fish
CLEAN HIS WATER AS SOON AS POSSIBLE!!! Ammonia is produced from the fishes waste. It is toxic and will kill your Betta fast!!! Do regular water changes.
If this black ink is comming from the fishes vent (anus) you need to do some more water changes and also improve the fishes diet.
You don't trim any fishes tail. If you do your fish will undoubtedly get fungus and die.
Control the population of fish and other sea life.