Restocking... Help?!

So I currently have a 4 ft tropical fish tank. In there, I have a few plecos (all are rescues and none have grown in the roughly 4 years they've been alive so no chance of growing now!), I have two medium angelfish, a rainbow shark (2 inches maybe?), a few glowlights and neons, and some black widow tetras. I've had tanks for roughly 6 years and recently lost my favourite angelfish. I have done all water tests and all are good, but was wondering what fish I could add to my tank? I know a few ideas but didn't know if there were any others I maybe haven't thought of?

 

All is good is not useful, plecos grow their whole life and get huge, unless you have bristle nosed or clowns plecos (I believe that's what the smaller species is called). A few is not really a number but I am guessing 3-4 and with that I would almost say you are stocked pretty well as is (Plecos regardless of species are filthy fish)

 

4 plecos.... One is a bristle nose, one is a sail fin and the other two are albinos of some type but the person I got them from had the parents so to speak, and they are still only about 2 inches big. My filter is bigger than the tank butI have put it on a lower setting so is fine for my tank. I would just like something new and a bright colour but doesn't need to be huge. Was thinking a swordtail or Molly or similar size. Idon't mind on if there's one or two, but not a whole school of 'newbies' in the tank. The mid to top section is relatively empty which is why

 

The swordtail should work well especially color wise, unless you'd go semI aggressive (I do have so I am partial towards those colorations). The bn pleco will be fine, and I am guess albino bn (Which should also be fine) but that sailfin will get huge (12-18") just an fyi

 

That's fine about the sail fin so you reckon swordtail would be a good way to go? I just would like more colour cause obviously most of my fish are silver or grey so would just like some nice colours without adding more tiny fish like neons

 

But if not, you have guppies, mollies(can be freshwater but prefer brackish), bettas(Yes most will say no, but I say yes it does work, but it also depends on the individual fish so you may not want to chance it yourself), danios, giant danios,

 

What kind of bettas? Sorry - I don't know much about them! Would like to know more before I rule them out

 

They are fighting fish, first and foremost (As in they will set up a territory) and depending on individual they should be accepting of mellower style fish...as long as they don't pester it. Mine is with mollies, silver tip tetras, cory cats and oto cats. And regarding specific bettas, that would depend on what they have and what you like