150 would be too small for any one of those fish, sorry. do you want a nice planted tank? that way you can get some really nice colors out of a vast assortment of fish. you could get aussie rainbows schooling around some nice vegetation... or a school of blood thirsty exodon paradox, (which is my suggestion to any and all that want color/activity/less upkeep than piranha with similar results).waylon;552762; said:I know you said you didnt want the biggest fish but if i had that tank i would get a red tail catfish big pacu maybey an arrwanna.Not sure thats all.
you could go with an asian predator tank with various cyprinids like bala sharks and apollo sharks. throw some gouramis up top with a few dats to patrol the middle, and you have yourself a nice asian biotope aquarium.
personally, i like planted tanks with a high level of activity, which you would get from all of these options. and i do like the oddball african tanks, you could get some rare fish with that idea.