Now if you know anything about fish or cichlids then keep reading, if you don't then leave because you're useless here.
I have 5 fish in a 20 - 25 gallon tank.
One is a algae eater, it's small, doesn't get bothered by any other fish.
One is a cichlid, not sure what kind but is always eating which is good, but has a few issues. ( Shakes rapidly, gets bullied, tail is bitten a tiny bit )
One is another cichlid that's the biggest and probably calmest fish ever but if another fish gets in it's territory then this big guy will rip it's tale off. Also has a few issues ( Bites the glass like pressing it's lips and fighting the glass, picking on others, not eating food very much )
One fish is a small one, same kind of fish has the one above ^ though. I think this is a female but yeah, has a two issues. ( Gets bullied, tail is bitten a few times )
The last fish is a rare black cichlid, HAS MANY PROBLEMS. ( I gave it a pellet once, and it swallowed it and looked like it was choking, it's mouth would open quick every 2 seconds and would shake rapidly and bite the window and smash into it, bullies all fish except for the king, though this one gets picked on by the king too, spits food out )
So yeah, if anyone could fix these issues, great, not then it's fine I mainly want help on the black guy ( lol ) but yeah.