Filter/Plant Questions

what medium larger sized fish would be recomenned for a 55 gal. and with what other tank mates
 
Ghosts will outgrow a 55G in about 2-3 weeks, what are you lookin to stock?
 
nothing really specific, somthing semi-agressive , and a some other colorful or playful fish. !st tank so really no preferance, but i would like so to grow to fill the tank.
 
Picked up a penguin 350 today for the tank. i added some bio supplement but i still need to go get some ammonia.
 
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