no, the puffers will not get on with oscars, and also often need brackish water.
oscars will eat puffers, and also you don't have enough room in a 20 gallon for the oscars, so you don't have enough space for the oscars and the puffer
oscars will eat puffers, and also you don't have enough room in a 20 gallon for the oscars, so you don't have enough space for the oscars and the puffer
