If this were going to be a long-term setup, I think the following idea(posted by redpaulhus in another thread) woud be fabulous:
Quote:
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Originally Posted by redpaulhus
In a large enough tank, a large adult oscar will leave small fish alone because they are too much work to catch for too little food value (poor energy return for the energy to eat them).
In my 125g tank I've got blue tetras, giant danios, odessa barbs, rosy barbs, and few tiger barbs as dither fish with a big (around 12") oscar and other sa/ca cichlids (dempseys, a small midas, blue acaras, green severums, and convicts) -- the dither fish don't get chased, the other fish eat pellets, flake, frozen food and live worms (none of which can swim away  )
My barbs tend to swim along the bottom and midwater (except when I feed, then they hit the surface) and the danios and tetras cruise the surface. There's also an adult gold gourami who would easily fit in the Oscar's mouth if he tried - but he doesn't give it a second thought.
The trick IMO is having a big enough tank and raising the fish without using feeder fish... |
So I figure that in a 75g you could have a big oscar and a good school of tiger barbs. Now that would be a smashing tank!