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Mollies,Platies, Guppies, small Tetras (I recommend Black Skirt Tetras), Corydoras, (Electric or German) Blue Ram Cichlid, and last but not least............ Apple Snails. ;)
If you are asking about the Black Ghost Knife fish they are natural predators and their prey is any fish small enough for it to catch and kill. They also have the ability to electrocute a fish to stun it. They will kill neons and guppies but mollys may be a bit big for them.
Mollies and black bettas.
Small, non aggressive, tropical freshwater fish. Examples would be other tetras, mollies, platys, swords, small gouramis, rainbowfish, some less aggressive barbs, dwarf cichlids, loaches, plecos, Cory catfish.
you could have guppies angel fish neon tetras platties blue rams tiger barbs and and and mollies otto cats cherry barb
Tetras are freshwater fish.
Mollies actually give birth to live young, they are one of the few tropical fish species who do this.
a black mollies babys are normally bigger than guppys babys, they are little black fish.
Bristlenose catfish (normal or albino), mollies, swordtails, black widows, some tetra species and sometimes bumblebee gobbies. There are many fish compatible with guppies.
i have a guppy and two black mollies in the same tank,and they get along perfectly fine so far.but sometimes,you get the occasional aggressive molly and it might attack your guppy. you should also ask your local pet store to see which fish can get along and which can't.
You will find that there is some disagreement about which fish are the easiest to raise, but Danios and Barbs appear on almost everyones list. On many lists you will find Tetras, Guppies, Mollies, Swordtails and Gouramis.
Peaceful fish, who aren't large enough to eat the betta. Many quicker fish like to chew on their long fins. Medium-small schooling fish (tetras, platys, mollies, non-fancy guppies) and bottom dwelling fish/frogs/snails are safe.