penguin tetras and red eye tetras

#1
Getting my 30 gal. quarantine tank ready to grow up my schoolers to eventually be in my 90 gal. altlum tank...Both the penguin and the red eye attain a length of 3"...as far as I can tell, that's about a long as S.American tetras grow...does anybody see a down side to my choice...I'm not experienced with altums(yet), but I doubt that they'l eat a 3" fish.Ken
cron