hey everyone....i'm new to MFK . i only hav a 20g tank with some african cichlids in tehr but i will get a 180 g this summer. so if any of u hav any suggestion about fishes to put. pls tell me. and, i'm not gonna put the cichlids in ther.....i'll probably sell them 
Crenicichla are awesome, and would do superbly in a tank that size...perhaps you should look into them...
. Plecos, arowana, and tons of other fish would work awesome in there as well! Your possibilities are endless!