Filter suggestion for a 180 Gal

I started out with 2 pair of Gold Gouramis, and they decided to start a family, so at last count I've sold 65 to the LFS and given a couple away...and still have a bunch in different tanks.
 
mleong.... why buy guppies? they are the rabbits of the sea.

Get 2 males, 10 females and you will have 200 guppies for your tank in no time.
 
I am using 2Liter of the Eheim Efisubstrate for the biology filtration, and about 6 packet of 150 grams charcoal for the chemical part. I will be adding another filter soon. I just added 5 Red Tail Shark to the collection yesterday. Was thinking to add a couple of dozen of the Tiger Barb and some Neon Tetra. What do you all think?

:)
 
Hey Hebdizzle, I will do what you suggested, but will the Gourami pick on the Guppies? (I have 4 more Black Widow Terta, forgot to include it in earlier). Possible to add in some Silver Dollars, or a few Bala Sharks?
 
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