New Fish Adding Question?

ok so I just got a big new tank from my mates nan and in there are 2 fire belly newts, and about 11 tetras (neons and black neons) a few guppys and 2 kuhli loaches (I know not enough loaches but I plan to get at least 3 more now cus I got the bigger tank). so now knowing what fish I have in there do you think I could add a 2-3cm bristle nose pleco without any problems. the tank has a very good filter and suitable hiding places. so what do you think, can I or should I add the pleco and what are some other small fish like the tetras that I could add that would be safe with all of the fish listed.thanks :)