well i have one that is only 3"s and he keeps a cobra pike,white saum gt,and a geo posted in the corner all day.So i had to put him in the 90g with the pikes.Its like biggie said
YOU CAN BE AS GOOD AS THE BEST OF THEM OR AS BAD AS THE WORST
Meaning in the 55g he was the man, now he is at the bottom of the food chain in the 90g