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.
A sucker fish typically has 56 chromosomes.
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.