Future tank :)

[Digital]

I recommend a lot of water changes / gravel vacs, and high over filtration.

 

[nano cichlids]

instead of a 180 geet a 210 or 240 and get the 2 Os ( still with 180 2 Os is good enuf ) a trio of firemouths or get 4 if u want. 1 GT 1 texas 1 convict 1 jack ( love my jack ) so heres the stock:
2 oscars ( or 1 if u want more rooom )
3-4 firemouths
1 GT
1 texas
1 convict
1 jack D.
tank: 210 or 240.

i dont think he had a 200 gallon tank in mind.... and even with that large of a tank there will still be aggression.... i say just keep a pair of oscars and maybe a GT but i wouldn't count on it