Ok my LFS has some really nice and adult (around 3'') leopoldi angels and I am just considering getting some..I know that angels and discus in general is a bad idea so I guess leopoldi's would be a very bad idea as I have read they are the most agressive of the angels...Thanks 
If I have 6 discus, 1 Threadfin acara, 1 poly. sen and an african brown knife would 4 angels be too many? Thanks
If I have 6 discus, 1 Threadfin acara, 1 poly. sen and an african brown knife would 4 angels be too many? Thanks