I keep schoel of 25 Hyphessobrycon eques (Serpae Tetras) with my Peruvian Sclare in a 225 and they are no trouble what so ever if kept in those numbers. Five Hyphessobrycon columbianus (Columbian Tetras) will have a tendancy to nip fins I would get 10 more for a 135. Loose the bala and red tail shark they get way too big for a 135. I have kept festivum and angels together with no aggression towards each other but not single fish, I've had 6 festivum and 6 angels that way they pay very little attention to each other. The loaches are ok they get too big for my taate and will IMO through the sematry of the tank off but you can get good money for them once they get big. I would rather do about 8 corys and stay with SA theam.