how big does he get - the banjo? as far as the picture goes i can only see tetras- sorry
i do think you can add more corys still
and as far as your upside down cats go get 1 more at least the profile on this sight says they only get to 4" and i've read other reports of only 3" so i think you would be alright.
and still reduce to one species of tetra
EDIT: i did not mean to offend you with my Q about the banjo; that is why it was a question- common names are commonly misused and i asked b/c if you had gotten a mislabeled catfish it would be pertinent information for you to have. i am pleased that it is not a pictus cat.
i do think you can add more corys still
and as far as your upside down cats go get 1 more at least the profile on this sight says they only get to 4" and i've read other reports of only 3" so i think you would be alright.
and still reduce to one species of tetra
EDIT: i did not mean to offend you with my Q about the banjo; that is why it was a question- common names are commonly misused and i asked b/c if you had gotten a mislabeled catfish it would be pertinent information for you to have. i am pleased that it is not a pictus cat.