I've kept fish for 25 yrs from 7ft Marine tanks to your more standard 4ft tropical tank (Guppies,neons etc)

I recently moved and am running in a 4ft tank (no fish in there)

What kind of cichlids would go together ?

Also is wise to currently buy fish on line or wait to shops come back (I live in uk) I'm not aware if any are open i live near Coventry

Any advice appreciated