Why does my female Gourami keeps chasing the Angel Fish away and attacking them?

[Aleksandr L]

I have a 20Gallon Tank
7 fish

2-Gourami
2-Cat Fish
2-Angelfish
1-unknown fish which i really dont know

My female gourami keeps chasing the angel fish and bitting they're tails.One of my angel fish tail all busted up and i feel bad for him.

All the other fish seem fine even the cat fish seem fine which people say they can get really mean.
the angelfish are very small less then an inch


my other fish which is cool with others is 3-4 inches silver and has black tips on its tail and fins
The catfish are around an inch they are silver with stripped and dotted black dots.
The large fish has the word Shark in it but I am not sure of its full name

[fishmandu]

Your unknown fish is probably a bala shark, or a tinfoil barb
look up picks of those two on the net and I bet it's one of those. Angels a tough to keep with other fish unless the others are very small tetras or some other timid types and small.

[Smart alec]

seperate them