Can you over filter your tank?

I just bought this for my 45-50 gal tank:
http://cgi.ebay.com/Penguin-350-BIO-Whe ... dZViewItem

Is this too much, can it harm the fish?

bump

alright cool!

also, i was wondering what type of fish i should put in with them.

i want some fish that will grow large with the sun catfish, but also ones that dont hide all the time. any suggestions?

alright, so i just got some ghost shrimp from the pet store.

i figured my sun cats would eat them. i heard somewhere that they will eat anything that will fit in their mouth...

is that true, will they eat these ghost shrimp?

how can you not breed the fish?

i dont understand why they wouldnt breed naturally, can you explain?

is there any way to breed sun catfish?

any ways to tell sex of the fish?

any help pls, i would love to breed mine.