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no they are not TROPICAL FISH NO NO NO BLACK ANGELFISH IS
Black Ghost Knife Fish are semi-agressive. They should be fine though. The angelfish should be fine.
You should not have any fish in a 5 litre bowl
There are not many fish that are compatible with Angelfish. Only Angelfish are truly compatible with Angelfish.
Yes, it is in the sucker fish family.
The angelfish is a breed of fish.
Depends on if you have a good filter or not, whether the water would stay clean enough. As far as getting along together, I don't think that 'sucker fish' (it is not clear what kind you mean) or angelfish would PESTER the tetras. And I certainly don't think the tetras would pester the 'sucker fish' or the angels.
Bigger fish eat angelfish such as catfish.
Sucker fish egg colour is bright yellow.
An angelfish is one of two varieties of fish, a Freshwater Fish of the genus Pterophyllum, or a marine fish of the family Pomacanthidae.
Angelfish eat other fish.
Not very likely, although if you live in a tropical climate it might ...