First three are assorted cichlids. I'm assuming those are in one tank, the 55?. My absolute guesses are...
1. Severum
2. Jack Demsey? (Probably very wrong in this one.)
3. Texas Cichlid
4. I "think" the fourth is a discuss, but I'm not sure what kind.
5. mono sebae.
Strange...a Mono Sebae is a hard water brackish water fish and discuss are soft, fresh water fish....I don't think this is correct, but is it possible it's a strangely colored scat instead of a discus? I could be completely wrong in this fish ID, but it looks like a discus to me.